Yeah, I've got ONLY my Gmail account added. It is totally OOB, stock, however you want to describe it.
System Version: 5.5.886.XT875.Verizon.en.US
If your next suggestion is to do another factory reset, I'm not going to bother. When I finished my last reset, first and only thing I did was add just my Gmail account to test it, and the error still persisted. It only happens with email messages; tried sending a message from my school email account to my Gmail address, and sure enough a few minutes later the Gmail app crashed.