midas

I think I've found the problem: Starting in Launchbox 13.15 something appears to have changed with how it passes characters in a file path to the emulator.
In all of my testing I'd either just copied the folder with the MvC2 CHD over to the new installation, or--when trying CHDs from different sources--replaced the file that was there (even changing its name but not its folder).
In my fresh 13.20 install however, I'd only placed the CHD file in the Sega Dreamcast folder rather than having it in a subfolder for the game.
In continuing testing this morning I happened to notice what appeared to be double spaces before (USA) in the folder name. I removed the extra space, updated the game's launch path, and the game launched fine.
So it looks like although Launchbox can see the extra space (it's visible when viewing the path in the launch location) it's not passing that on to Retroarch when telling it to launch the game. This is shown in the log console I posted before, where it said it couldn't read the attributes of the file--of course it couldn't, because the path it was given didn't have the extra space in the folder name.
To further test this, I went to a game I've launched a hundred times: Castlevania - Symphony of the Night on PS1.
I launched the game successfully, then exited. I located the folder with the BIN/CUE and added an extra space to it. In Launchbox I edited the metadata, went to the Launching section and browsed to the new location of the .CUE file. I confirmed that the folder now showed the extra space.


  I saved the settings and tried to launch the game. It did not launch. I renamed the folder to remove the extra space, re-browsed to/selected the .CUE and saved the settings. I successfully launched the game.

I think I've found the problem: Starting in Launchbox 13.15 something appears to have changed with how it passes characters in a file path to the emulator.
In all of my testing I'd either just copied the folder with the MvC2 CHD over to the new installation, or--when trying CHDs from different sources--replaced the file that was there (even changing its name but not its folder).
In my fresh 13.20 install however, I'd only placed the CHD file in the Sega Dreamcast folder rather than having it in a subfolder for the game.
In continuing testing this morning I happened to notice what appeared to be double spaces before (USA) in the folder name. I removed the extra space, updated the game's launch path, and the game launched fine.
So it looks like although Launchbox can see the extra space (it's visible when viewing the path in the launch location) it's not passing that on to Retroarch when telling it to launch the game. This is shown in the log console I posted before, where it said it couldn't read the attributes of the file--of course it couldn't, because the path it was given didn't have the extra space in the folder name.
To further test this, I went to a game I've launched a hundred times: Castlevania - Symphony of the Night on PS1.
I launched the game successfully, then exited. I located the folder with the BIN/CUE and added an extra space to it. In Launchbox I edited the metadata, went to the Launching section and browsed to the new location of the .CUE file. I confirmed that the folder now showed the extra space.


  I saved the settings and tried to launch the game. It did not launch. I renamed the folder to remove the extra space, re-browsed to/selected the .CUE and saved the settings. I successfully launched the game.