Hey, sorry if this is the wrong place to put this. I bought PA and PA: Titans recently and am having a lot of fun. After hotfix 88163, I can no longer launch game through steam. To be more specific, when I click the play button in Steam, it starts the PA process (which I verified on the command line using ps) but nothing else happens. Steam doesn't let me try again until I kill the process with kill -9 (regular kill doesn't work, so I guess it gets stuck in a loop or something). If I launch the game via the command line, then it works fine. I'm not using any command line arguments in Steam. I'm on Ubuntu 15.04 using the unmodified Unity desktop, playing the game with an i7 4790k and a GTX 970.
Can you post a log from a session where you launch PA through Steam? You'll find those at "~/.local/Uber Entertainment/Planetary Annihilation/log".