I've been suffering with this problem for quite a while, and finally found a fix.
If you are using Opera 12.16 or 12.17 (the last of the 'old and good' Opera versions, a fix can be found at http://forums.opera.com/discussion/1...cket-issue-/p1.
Look for the post by drewfx, dated March 28 and follow the destructions. Best to keep a copy handy just in case it doesn't work for you, so you can revert to original settings.
Just in case you don't know, yu get to the "opera:config" page by typing "opera:config" (no quotes) into the address bar.
Hope it helps.