The user-mode dump won't reveal anything, I'm afraid.
We had even a kernel-mode dump previously - and it showed ZoneAlarm driver blocking the file open.
If you check Google, you'll find many reports of the same problem, unrelated to avast! (= occurring on a machine without avast!).
Maybe you can restrict the exclusion (I believe it was the tracking.log file, causing the problems, though I may be wrong)... but that's about all.