F-Secure internet security 2012 causes global system crash when using Opera browser
After several months of tracking, it has become clear that F-Secure Internet Security 2012 is causing global system freeze (i.e. system not responding at all and a hard reboot is necesary) after a few hours of using the Opera browser.
You can see the thread on the Opera community website here: http://my.opera.com/community/forums/topic.dml?id=1367822
Several people (including myself) have solved the problem by reverting to version 2011.
This may be related to another bug that was fixed earlier this year (http://community.f-secure.com/t5/Protection-Safe/Please-FIX-this-bug-with-Opera/m-p/4869/highlight/true#M969)