JoeViking245

If you let MAME know where the ROMs are, it only needs the filename (without extension).  e.g. gradius (vs. gradius.zip)
That said, you have either
manually set the ROM paths in MAME itself (told it where they're located), you placed them in its /roms/ folder (default location for where it looks) or... in the Details section of your MAME emulator (in LaunchBox), the Default Command-line Parameters has the variable -rompath %romlocation% in it. %romlocation% is a LaunchBox variable in which it replaces that with the full path to the ROM with quotes  "C:\Path\To\Rom" e.g.  "X:\_RomArchive\__zipped sets\_Mame Roms\MAME 0.283 ROMs (non-merged)"  
NEVER unzip MAME ROMs.  That's just how MAME (and any emulator using MAME ROMs [e.g. SuperModel3]) works.
 
Some emulators need to have the ROMs unzipped to be able to emulate them.  90%+ of the cores in RetroArch for example.

Depends on how you have MAME setup.
Where are (were?) the ROMs located?  Did they get moved also?
When you edit your MAME emulator (in LaunchBox), does the Default Command-line Parameters have -rompath %romlocation% in it?

On a page (or a couple) prior to that last page, check the box Force import duplicates.  If the last page now says 1 game to import, it was already imported somewhere.  If it still says 0, exit that, press Ctrl+N and manually add it that way (in the launching section, point it to your invaders.zip file).

These should be !{F8 down}  vs.  {!F8 down}

You can thank me IF it actually works.  

Go to: Tools < Download < Force Update Games Database Metadata...
When that's done, try it again.
 
I tried [close to] the same thing...
Pressed Ctrl+N to add a new game  Manually typed in the platform Microsoft Xbox 360 Typed in the Title Ride Pressed Enter to have it search.. LB said the local database needed an update, so clicked Yes to downloaded it Got the same results as you did (everything except Ride) Closed that and ran the Force Update Add... Platform... Title... Ride was the only game that showed up Success!

The "problem" is, Configure shouldn't appear there.   
That is (I'm pretty sure) just for MS-DOS/DOSBox games.  Edit the SNES game and look in the Launching section.  Is there something listed next to Configuration Application Path:?  Is whatever's in there, part of the game? My shoot-from-the-hip guess is, No. Remove it and click OK to save and close.

This is a known issue, under investigation.  Read here for more information:
LaunchBox Error When Attempting To Download Video Media From Steam - LaunchBox

To download videos and music directly from within LaunchBox, yes. You will need an EmuMovies paid subscription and have that account linked (Tools < Options < Integrations < EmuMovies).
In your license email you received, historically there's been a discount code for EmuMovies included in there.
 
Alternately, there are (I believe) a couple plugins in the Downloads section here on the forums than can (or at some point, were able to) find and download (YouTube??) videos.  Thought I don't recall seeing one that does Music.

Good thing they give you options.   

How are you launching Ryujinx from LaunchBox? Direct to the exe file? or via a batch file?
Are you running LaunchBox as Admin?

Right-click the platform and select Edit.  Go to the Parents tab and uncheck Root (leaving just the Consoles (Category) box checked). Click OK to save and close.

Try force downloading the update.   Tools < Download < Force Update Games Database Metadata...

This is what I have and is working here.


Check that you have the startup screen enabled.  That's the point (well, one of them) of startup screens. To hide the flash of potential UI's.

Run fbneo.exe.  Click Game - Most Recent Games.  Look at one of your MD games that you played.  Look at the filename to the right of the Title.
On my test, I ran A Bug's Life using a MAME softlist ROM bugslife.zip.  What FBN shows as the filename is md_bugslife.
In LaunchBox, I edited my FinalBurn Neo emulator.  In the Associated Platforms section, I added to the Default Command-Line Parameters for my MD platform, md_%romfile%.  And [for me] it worked.

In the Details section, Remove Quotes and Remove File Extension are both [still] checked.
 
This assumes you have your ROM paths set in the emulator itself.  Which I imagine you do, because you indicated the games work directly from the emulator.

Note that both LaunchBox and Big Box after closing/exiting, by design, does do work in the background to save data (aka, save any changes and create backups of changes to your Data folder).   Depending on the size of your build, what changes were made [and to a degree, your system specs] this may take upwards of a couple minutes. But typically, shouldn't take that long.

Assuming that it works correctly as is (after having to click MAME in the taskbar), try running the command(s) minimized.
run, %comspec% /c echo m3.1 > com 3,,Min $Esc:: { run, %comspec% /c echo m3.0 > com3,,Min WinClose, ahk_exe {{{StartupEXE}}} }  

Yeah, it says "Board is in Keyboard Mode".  But can't read what board is attached.  I can read "PAC" and assume that's a "4" after it (though doesn't really matter).  I only have an older I-PAC Mini that doesn't have any options other than Keyboard Mode.  So what I asked before is about the extent of my knowledge. 😊
Hopefully someone who has an I-PAC 4 running in keyboard mode can chime in with their findings.

Tools < Options < General < Save Management

You might try Tools < File Management < Restore Data Backup...
I personally haven't used this tool, but I presume the prompts should be fairly descriptive.

With MAME 0.139, the command-line parameter -keyboardprovider dinput is not an available parameter.  It was added in version 0.168.  So you will need to remove that from the Default Command-line Parameters in BOTH the Details section, and in the Associated Platforms sections (if it's also in the latter).
 
If after removing that parameter they still don't launch, as @mikekim suggested, place (move) your ROMs into your ../Arcade Flag ship Gametron Mala/Mame/mame0139s/roms/ folder.
Then in LaunchBox, you can: Select all games in that platform (click one, then press Ctrl+A to select all), then go to Tools < File Management < Change ROMs Folder Path for Selected Games... and select the "roms" folder [above].  This will point the ROM paths to their new location [without having to reimport them].
 
 

The error indicates something is up with your license file. Email `support@unbrokensoftware.com` and they can sort it out for you.

The override is only for disabling the startup screen.
The only "option" to display a different startup up screen per-platform is to have an xml file in your selected startup theme's folder named the exact same as the platform.
And note, that is per-platform. Not per-emulator. As in, the emulator is (should be) irrelevant.
 
Example: look in your \LaunchBox\StartupThemes\Default\ folder.  If you launch a game from your "Sony Playstation 2" platform, it will use the "Sony Playstation 2.xml" file for the startup theme.  If you launch a game from your Windows platform, since there isn't a Windows.xml file, it'll use the Default.xml.
 
Since you're using the StageBox startup theme and it ONLY has its' Default.xml file (no platform-specific xml files), setting StageBox as your Startup Theme in LaunchBox, all platforms will use the same file when loading a game.  Unless you disable it specifically for the platform or a game(s).  When disabled, it won't show any startup screen.
 
Why your Windows platform is using the Default.xml from the /Default/ theme folder instead of the /StageBox/ folder, I have no idea.
Can you share screenshots of the loading screen when launching from a platform it does work in, and then one when launching a game from your Windows platform.
 

Try changing the title to "Project X: Light Years", then searching.
If it still can't find it, try force updating your local database under Tools - Download - Force update...

Like @C-Beats, I don't recall how the MAME installer was actually set up (compared to other less 'odd' or unique emulators).  But with other emulators, when you see a message similar to that, it will also ask if you want "us" to install it.
That aside.... Since you have your 30-40 classic Arcade games added to your LaunchBox collection already, at this point I'd suggest:
Go to Tools - Manage - Emulators and click Add Type in "MAME" for the Emulator Name and it will auto-populate most of the settings At the right-end of the Name field will be an icon that is a link to the MAME download site.  Click it. If your MAME ROMs are from the current 0.281 release, download the mame0281b_x64.exe file If your ROMs are from an earlier release, at the top of that page, click Downloads and select Previous Releases Scroll down to where you see the release number that matches your ROMs Click the file under Binary (Windows) for that release Once downloaded, run the executable from Windows Explorer If you get a Windows protected your PC popup, click More Info and then click Run anyway I recommend extracting it to your /LaunchBox/Emulators/ folder e.g. Choose:  D:\LaunchBox\Emulators\MAME\ Be sure to add MAME on the end of the path Once finished extracting, back in your Edit Emulator window To the right of Application Path, click Browse and navigate to the folder you extracted MAME to and select "mame.exe" Right below Default Command-line Parameters, add to the end of what's there (if it's not there already), -rompath %romlocation% e.g.  -keyboardprovider dinput -rompath %romlocation% Click on the Associated Platforms label and make sure Default Emulator is checked on the Arcade line. Click OK to save and close the Edit window.