I'll bet money it's Cultural City Styles. Frankly it's impossible for Geomodder to have done as much work as he has without typos making it in, and typos in the LSystem causes crashes. As I said there are absolutely no debugging tools to find these either, so he's kind of stuck. The only way to fix the critical bugs in the LSystem is to go by user reports, and hunt the crash down for each individual report, I know I had to go through this a month ago; this process has never happened for ethnic city styles.
Basically what happened is Geomodder came out with an update to city styles, and everyone announced things fixed. Calling it so, doesn't make it so. Read through the Ethnic city styles thread if you don't believe me. Anyway unless Geomodder is a super perfect android, there simply is no way all that data entry is bug free.