divarre: Hi there,
I was having this problem ("FATAL ERROR") on Mac when starting a new game.
I tried updating SOMA using GOG Galaxy by selecting "More -> Verify / Repair" and it downloaded the patch. However, it couldn't be installed because it said SOMA was already running.
The messages were: "Getting file list" -> "Checking local files" -> "Allocating disk" -> "SOMA installation postponed (game is running)". See screenshot attached.
I checked in Activity Monitor and no process that would look like SOMA there.
And I trashed all files in ~/Library/Application Support/Frictional Games/SOMA and restarted but to no avail.
I restarted my computer twice (I don't keep my applications running when I restart) but still the same.
I updated to Galaxy 1.1.3 as well (I think I had 1.1.2 beforehand).
Eventually I downloaded the patch directly from GOG's site (patch_soma-day1_fix.pkg) and installed it and then launched the game directly from my /Applications folder and it worked! Thanks :)