No, I only know BASIC. But I posted that in regards to troublesome bugs that you cant find, but when you do its staring at you right in front of your face.

Happens quite often in the world of programming.

The biggest cause is how you handle variables, thier sizes, datatypes and boundaries. Plus whether or not they get overwritten with one subroutine and causing another one to crash for the failure of variable checks and balances.

I would start by installing a debugger like macsbug; etc so you can find out when where and how it crashes