Jazei, were you not kidding about AVG?
There have been a number of reports that AVG has not played well with Opera, at least in the past. I know it was definitely an issue reported with Presto Opera at times. The problem seems to be episodic in time... that is, there will be spells when users report it, and periods when they don't. Usually it seems to have to do with over-aggressive heuristic detections of behavior or with a "bad" set of signature updates. There are also some other anti-malware software that seem to create Opera problems or peculiarities, Vipre being one of them.
