Sorry, missed this before.
What sort of custom games are you trying to create? Historical custom, fictional custom, etc...? Did it crash going through the wizard (if so, at which step)? Or through the advanced menu (was it while clicking on a tab, or after clicking create game)?
I know you mentioned not highly customized, but just wondering what the general options you we aiming to use, it could be something in there causing the issues. Depending on the above, we may need a trace file (
https://forums.ootpdevelopments.com/...03&postcount=9) to further understand what's going on.