It's probably already solved and just my steam that won't update (again). But the game seems to crash when clicking with my mouse to much or something. I don't know, it just crashes when I do things to fast in the game or something. Also it is a little laggy on my computer, although I guess that's not to unusual for a Beta.
Next time it crashes, could you please upload the log file here for me?
It is located in the Steam Application folder, GearCity folder, GearCity folder again. The file is named Logfile.log
What is it that you're clicking?
Here is the logfile, I am clicking on or dragging around materials when designing a car.
I've found that when I drag tires, mirrors, or lights it helps to be on an angle. About a 45 degree angle works best, where you can see as much side as front or rear, if that makes sense. This works especially best for me with tires. Just in case this is part of the issue
I'll give it a try, thanks!