After upgrading fs2 open from 3.7.2 to 3.8 with Knossos, on Ubuntu 18.04, I'm encountering a weird bug:
the game launches just fine, but after I create a pilot and click "select", the main menu appears and just goes unresponsive.
Cursor moves but I can't click on anything and mouseover animations won't appear. To quit, I have to alt-tab out of the game and kill it.
Sometimes, the main menu will work properly, until I bring up a dialog (like restart mission, quit game), then it will go unresponsive.
The behaviour is identical on retail and MediaVPs.
In fast debug mode, the debug log will remain empty.
I thought maybe that was a library issue with the AppImage used by Knossos and built the game myself from the master branch available on GitHub, but the issue is the same with that build.
Reverting to 3.7.2, the menu and dialogs work again. I have no idea what could be wrong here...