Attempting to play content (any scenarios) from the Workshop causes a CTD, followed by Virtual Programming's crash reporter.
The crash report is verbose but suggests it's something to do with image handling; the scenario page in-game lacks thumbnails from the missions; just the standard placeholder.
Go to 'play' > Scenarios > Any Choose any workshop mission.
Pastebin from VP crash report is here:
Hello, we really appreciate you tests of our port in Gentoo, but please keep on mind our specifications.
There is also Limited User-Generated Content compatibility listed.
Arma 3 Mac/Linux port is available for Ubuntu and Mint distros. We are sorry for any inconveniences you are experiencing with other distros, but there is not much where we can help you.
Some other users have tried different than supported distros. If they shared their fixes and experiences, they will be probably listed on our forum.
https://forums.bistudio.com/forum/196-arma-3-ports/
We are also retesting, if its possible to create and publish mission via Workshop, but only on Ubuntu and Mint Linux distros.
Thanks for valuable input.
Issue was reproduced on Ubuntu and also on MacOSX.
It was reported and it has been scheduled for a fix.
Thanks again for valuable input.