Hi Chris;
Can you tell us ...
1) What O/S version & bitness are you running under?
2) Have you applied any EBF's to PB 12.6 (latest is build 4088)?
3) What object events and/or functions are you trying to debug?
4) Have you optimized your PBL's recently?
5) I assume that you are using PB Classic?
6) What type of Application Target are you using?
7) Are you trying to debug sensitive events like Get/LooseFocus, Activate/Deactivate, etc?
Regards ... Chris
FWIW: I use PB Classic v12.1 & v12.5.1 every day on W7 & W10 and I can't tell you the last time either IDE crashed.