JoeViking245

LaunchBox does not look at nor touch mame.ini.  It only passes command line parameters to MAME which override ini settings per MAME's order of presedence.  
e.g.  if you look at the parameters LB uses, one of the default ones it adds is -nofilter.  Which of course, you can remove.

When I did some testing yesterday with an Arcade full set of 22,409 games, the Searching EmuMovies for Arcade Full Set media... took 14-minutes.  Then it was able to start Downloading xxx of yyyy media items.
After 48 minutes of 'good' downloading, it encountered what I presume to be the + sign issue. At this point it would start the Searching... again for 14-15 minutes. Then do some more downloading and continue the cycle.  Each time it 'cycles', yyyy would increment (in my test) by about 2500.
 
Pretty sure it's on the LB side and I will talk with our developers early this coming work week about it.  (Monday? Tuesday? Wednesday (hopefully, at the latest)

If you edited the Default Pause Theme directly, an update would have overwritten it back-to-Default.
If you made a copy of the Default theme folder (e.g. Default - Copy) to make your own theme and edited that, it should still be there.  Double-check that it's still set as the Startup Theme in Tools < Options < Gameplay < Game Startup.

You pressed the hotkey shortcut Ctrl+Shift+R so you don't have to go into the menu(s) to hide games missing screenshots.  Pressing that key-combo will toggle that on/off.

Try importing some games into the platform 1st.  If the platform doesn't have any games in it, it won't show up. 

Start with checking that it's enabled in the VPX emulator.

 
Next make sure that it's not in Exclusive Fullscreen.

Email support@unbrokensoftware.com with your details and they can sort it out for you.

Those platforms missing platform icons are not included in the default Media Pack or are named differently than normal.  e.g. If you renamed "sega32x" to "Sega 32X", a [default] icon would appear.
You can look inside ..\LaunchBox\Images\Media Packs\Platform Clear Logos\Nostalgic Platform Clear Logos\Platforms\ to see what default images [and their naming conventions] are available.
 
If you have LaunchBox Premium, you can create your own images and add them for "the other" platforms.
For information about adding them, go to the LaunchBox Strategy Guide and scroll down to and click on the article Creating Platform Icons Media Packs for LaunchBox and Big Box.
Be sure to check out (or at least glance through) and see what other articles are available in the Strategy Guide [for potential future referencing].  

The error indicates something is up with your license file.
Only support@unbrokensoftware.com can help you with this.  Give a little time for them to reply.  May also check your spam folder in case it got placed into there.

If it helps any and you have Advanced Search enabled, you can filter it down by platform.

 
This can be exported to Excel (or your spreadsheet app of choice) which should be a lot faster.
 
Otherwise, I don't believe there is another built-in way to do so.

Hmmm.  Worked here. Did you make the 2 changes with BB closed, saved them, then opened BB?
Either way, it didn't look very good on my end.  Namely, the video was offset to the left.  And the rating image being cut off.
 
Like @Maddoc1007 said, CZ-v2 doesn't [appear to] have a Wall4GamesView.xaml view file.  I believe what's supposed to happen in that case is it will load "the view" from the Default theme [as a backup].  As you can see, these 2 "different" views look.. well different.  So no idea where CZ2 is getting it from.
 
If you want to use CZ2 and are ok with the Default's Wall-4 view, what you can do is:
Set your theme to CriticalZoneV2 - Default Map a key (or controller button) to Switch Theme Go into Game View (aka select a platform) Press the key/button you mapped Select Default Assuming it was set to the Wall-4 view, you'll now see the Default Wall-4.  The caveat is you need to do this for each platform. I couldn't see a way to do it automagically for all platforms.  But admittedly I didn't look too hard.  And also, I'm not a theme guy.

Give this a once over and see if it helps.
 

You can find available parameters here:  LaunchBox Built-in Command Line Variables - LaunchBox
The one you want to use is -rompath %romlocation%
-rompath %romlocation% apple2e -gameio joy -flop1 Placement of the variable is key.  (and you can leave the 2 checkboxes checked)
e.g.

 
If you want to do it similar to what you proposed, I suppose you could use:
apple2e -gameio joy -flop1 "%romlocation_noquotes%\%romfilename%%romextension%" %noromfile%  

Does this folder exist?
    ..\LaunchBox\System\Software\LaunchBox Reader\
And does it contain all 236 files?
If not,
go to Tools < Manage < Plugins... Select LaunchBox Reader Click Install (or update or whatever it may say to add it)

I don't know "the" answer. But might try checking/un-checking these 3 options and see if any combination there-of fixes it.

 
Myself, I'd stick with DuckStation. But that's a personal opinion.  

There was a change in accessing what the latest version available for RPCS3 is.  The developers are aware.

You need to contact support. They're the only ones that can help with licensing issues.
email support@unbrokensoftware.com or https://forums.launchbox-app.com/contact
 

Is it working (bezels get downloaded and show) for other platforms? 
If you're on version 13.27, there was a bug with the download procedure. And if so, you can roll back to v13.26 [where it last worked], hop onto the 13.28 beta release (where it's been fixed), or wait until the official v13.28 is released (I'm not sure of the ETA for that release).

VLC has been overhauled in the 13.28-betas and ffmpeg has been removed.  (if that helps any. )
 
You can opt into the beta releases under Tools < Options < General < Updates (if you so desire to test and provide feedback).  Or wait for the Official release.  I don't know the ETA for the 13.28 Official release.

It's for the Automated Imports feature.  If your collection is pretty well established, you can probably go ahead and disable it.
This process has been reworked in the current beta releases for 13.28.
"Improvement: Automatic ROM Import now runs in the background with clearer progress, completion, and error notifications"

Not sure what version of LaunchBox you're on, but v13.28-beta has an update fixing an issue regarding the Big Box startup videos.
 
If you so desire, you can opt into the beta releases.   In LaunchBox, go to:   Tools < Options < General < Updates

Look in    Tools < Options < Visuals < Game Details
Is Show Videos checked?

This has been fixed internally and will be available in the next beta release (13.28-beta-5).  Or you can wait until its (13.28) official release.
Thanks for you patience.

These should all be taken care of now.

I can't attest to the other moderators or the LaunchBox staff, but myself, I don't use RetroAchievements.
That said, I do know there is this article. But alas, I've never really read through it. But hopefully there's something in there that can help.
Troubleshooting RetroAchievements Badges in LaunchBox - LaunchBox