We've had a player OpalMonkey comment to us on steam that Avast antivirus is blocking access to the path location for our saves, which is possibly causing the crash.
After doing some testing (removing old snapshots, cache, etc.) I realized I didn't know where the saves were anymore. Turns out that since the saves have been moved to the "Documents/My Games/TerraTech" folder it seems that my AntiVirus's (Avast) RansomWare shield was blocking TerraTech from creating images. Though the save games didn't seem to be blocked.
I say "seems" because I haven't 100% confirmed it. After adding an exception to the RansomWare shield things are working fine. So hopefully that was it.