When you try to deposit gold at the Briricca Bank, if you've got ~40k gold, it'll tell you that you don't have enough to deposit it, and if it's the first time when you are opening the account, it'll take the fee from you and then fail to open the account repeatedly.

I think this is probably a result of an overflow of a "short" integer probably, since it seems to happen right in the range where that overflow would occur.