Old thread, I know, but maybe this info can be helpfull
My setup:
A2000 rev. 6.2
2mb chip with MegaChip
Blizzard 2060 with SCSI and 128mb ram
Indivision
Piccolo SD64 4mb
I use OS 3.9 with BB2
The SD64 test program (for bus errors) has run for over an hour and counter was above 5000. No problems.
With CGX4 (+latest update) system runs fine, but as soon as I use a blanker (from Amiga OS or my favorite CGXblanker) system crashes within the hour. But WHDLoad works when I use the tooltype NOAUTOVEC. Running a demo from WHDLoad for over 8 hours is no problem.
With P96 (2.0+) there is no way I can get WHDLoad to run any demo (I use the 9Finger demo to test) normally. The 9Finger demo shows the intro picture, but hangs after showing this intro pic. F10 doesn't work and system hangs. All kind of tooltypes (like NOAUTOVEC, NOMMU etc.) won't help to fix the problem.
After reading this thread (thanks for the info) I decided to try P96 1.25 from Aminet to see if the INT is also the problem. CGXBlanker does not work yet, but the Amiga OS blanker has run all night without crashing, and WHDLoad works also (with also tooltype NOAUTOVEC).
Now only find out what stops CGXBlanker from running, and I am a happy man

For that I will try to use P96 2.0+ with driver from 1.25. I'll let you all know

Update: CGXBlanker is running for over an hour now with updated P96 software and old driver(s)...
Edit: anybody knows where to find a copy of P96 1.35?