I'm having something of the same problem. I have been pulling my hair out for two weeks on this. I select a ship, and whammo, it dumps me out. It will also dump me out if I select the shipyard. I can select the planet, and research, but ships are right out. Also, I do have a custom race, but nothing fancy in graphics however.....just a custom race amazingly like the Terrans. I've submitted two tickets on it, one with the dedug.err attached, and I haven't heard a peep. How do you delete your custom race? Get rid of your Prefs file?
It seems that the beginning of the end in the debug file is the following line:
Dumping Stack Trace: SymInit: Symbol-SearchPath: '.;C:\Program Files (x86)\Steam\steamapps\common\Galactic Civilizations III;C:\Program Files (x86)\Steam\steamapps\common\Galactic Civilizations III;C:\Windows;C:\Windows\system32;SRV*C:\websymbols*http://msdl.microsoft.com/download/symbols;', symOptions: 530, UserName: 'ME'
I even rolled back one set of Windows OS updates I got on 4-15-15, but to no avail...
If any of you have any ideas, I'd be grateful to hear them. I had to have an emergency appendectomy late Friday night, and It will be boring if I cannot play this normally excellent game for my recovery period.