New Vegas not running bug fix (don't know where to put this)

[cprin21]

Getting the message "An instance of New Vegas is already running" when trying to run the game through Mod Organizer 2?

The New Vegas not opening bug is due to the compatdata folder in ~/.local/share/Steam/steamapps/. New Vegas' compatdata folder is 22380 as that is its steamid. What was happening with me is there was a 22380 folder there for New Vegas despite the game not being installed, messing up the game once it is installed.

TO FIX: Make sure New Vegas is uninstalled, modorganizer2-linux-installer is uninstalled for New Vegas (including the removal of the folder modorganizer2-linux-installer creates), and the Fallout New Vegas folder under ~/.local/share/Steam/steamapps/common is deleted. Delete the 22380 folder under ~/.local/share/Steam/steamapps/compatdata. Install New Vegas as normal, install modorganizer2-linux-installer for New Vegas as normal.

[cprin21]

The reason I put this here is others were looking for a fix for this, and no I don't believe it's an issue with any MO2 installer script but rather a bug on the side of Steam where the compatdata folder was being populated with 22380 before New Vegas was installed. This wouldn't be a problem unless of course you were trying to shim MO2 in when you launch New Vegas, something you can't blame Valve for not predicting.