I've started having a very big problem since the silent update to Opera23, I'll try to see if disabling hardware acceleration works.
Here's what happen: when I close a tab with the ctrl+w shortcut, about 2 times out of three, the whole browser restarts.
Very annoying since I have a bad connection and often leave a tab to load in background while I read something on a lighter page (e.g. video loading in background while reading a blog)
Has anybody experienced the same problem?