JoeViking245

It moved to here:  MASH's MAMEINFO

At first, it sounded like something was done to do a mass edit on all your games. Which was really odd.
That Feature, also found under View - Show/Hide - Versions, toggles showing the version along with the games Title in the Main section.

Maybe take a look at this.  Note, it will only show MAME cabs (so you don't have to look a bunch of other junk). Also, not all revisions will show having any "new games" (like the last 2 or 3 revisions).  With just MAME cabs, you won't see new "prototypes" and the sort. 
I suggest 1st creating a new platform (Tools - Manage - Platforms).  Then import the "new games" into that platform.  From there, you can sort as you had previously done into their "proper" platforms.  It shouldn't be that bad. e.g. 0.279 will show only 9 games.  Worst case, it'd be a good start.
 

Not a fix nor a workaround (especially if it doesn't prove well ), but a test of sorts...   Tomorrow (or the "next day"), before doing any "Search", run 
Tools < Download < Force Update Games Database Metadata...
and see if that process is any better (faster).  When that's complete, then do your searches.

This is a known issue and has been resolved in v13.25-beta-3.  Can read more about it in this article:
Feedback - LaunchBox
If you wish to not update to the beta, be sure to click Continue Reading in the article for temporary workaround(s).

This article should help give some insight. After following through, report back if you're still having issues.

"Could not install MAME because the archive could not be extracted" Error - LaunchBox

I know there's a few emulators that LB will see what "it" (the emulator) has installed, and import then per that.  But I don't believe that was implemented for Switch emulators. (I could be wrong)  I'm not for certain on how or where it looks for "new games" for this particular platform.
You should be able to turn off the auto import feature for the platform.

For troubleshooting purposes, double/triple check your LaunchBox settings for the platform and maybe share some screenshots.
In LB, edit the emulator and share a screenshot of the main Details section and also the Associated Platforms section (where your N64 platform is visible). Verify that Default Emulator is checked.  Verify that Extract ROMs is un-checked.  You already verified the correct core is selected.
Edit one of the N64 games and show the Launching section (verify it's pointing to an n64, bin, or whatever format you ROMs are in).  Also show the Emulation section (verifying that RA is the set emulator and that there are no overrides set).
If your ROMs are zipped (for some reason), confirm there's just 1 file inside it. (In this case, Extract ROMs [mentioned above] would be checked). If there's more than one file inside the zip, the wrong one may be being send to RA.
If your ROMs are zipped, (for testing purposes) try extracting one of them, point that game to the extracted file (making sure extract ROMs in unchecked in the emulator) and try launching it from LB that way.

Well, (2) is the "bundle" which includes both licenses (Windows and Android).  So you would only need (1), the Windows [only] Lifetime Premium plan.

I don't believe any platform imports games based solely on the LaunchBox Games Database.  Pretty sure they're imported based on the games filename. And in some (most? all?) cases, the file extension as well.
The Arcade platform (or Scrape-As Arcade) is unique to most all other platforms.  It imports games base on the filename and extension also, but then looks them up (cross-checks) them against the MAME.xml file (located in the Metadata folder).  This file is created by running mame.exe -listxml, as mentioned earlier.  This will produce a "list" of all Arcade machines [available to MAME].  The 2 you mentioned were removed by MAME at the request of the games' developers.  Note: not all games in the "list" are playable in MAME.
For the MAME derivatives, e.g. HBMAME, they generally use the same set of ROMs and are able to emulate some games MAME can't. And they may also add in those 2 in question (and others?).
 
I'm not sure if these other Arcade emulators have an available -listxml parameter or at the least, a definitive list of the ROMs (along with the machines game Title) they can emulate.  If they do, you might want to put in a feature request to include a custom importing feature for games using those specific emulator(s).  (Top of this page, under Help & Support)

Assuming the games run in Demul standalone, check all 3 boxes.

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.