I had a customer who couldn’t connect to certain websites (always secure websites, eg: when paying for movie tickets online).
IE7 would display “engine error” on the fraud monitoring bar near the top.
After changing some settings I eventually find that norton 360 is the culprit. The solution (after a search of the internet) was to disable Norton transaction security (despite many suggestions to reinstall Norton, I’m reluctant to do so, as the problem could just reappear again…)
I’ll need to monitor the Norton / Symantec website, and hopefully they will pull their finger out, and provide a patch to fix the problem (and hopefully not release such buggy software in the future… that will be a first for them).