Cheers Jim. I'll persevere a little with gdb. I have gotten a little closer to finding my problem but I am completely stumped as to why a buffer overrun would be happening - I can't even see any heap variables being changed at the point it's all going wrong. It turns out the problem wasn't where I thought it was Oh well.

Cornedbee, no that's definitely what I want.

I'm off work til Tuesday now (hoorah) so I may be back with more problems then