I admit I was a bit lazy with this (investigating this). I now removed nspluginwrapper and I'm a happy camper (didn't know It wasn't necessary at all in my case). Everything is smooth now (page renderings containing flash video...).
If you have a specific example of a publicly available web page that consistently caused the infinite loop, it might be good to submit a bugzilla. The only consistent example I have is a password protected banking app (and I don't really want to include my bank account and password in a bugzilla so they can reproduce and maybe track down the bug :-).