I have something similar, since recently. Using 24.0.1558.3 I am having problems with tab displays. I was 'cleaning up' i.e. deleting unused or just closing tabs that are on the bookmarks bar. Quite suddenly the tabs would not go away!! i.e. they remained there even though I had "x-ed" them. Didn't happen until I had done a few (about 5) tabs.
Now I have more and more display issues - such as the screen up/down arrows are gone! but work if I hover over the black line on the RHS side of the page; the back/forward arrows are not showing (i.e they remain grey but are working!! Tabs don't go away, as I said, I have to right click and close them to make them disappear.
Won't load sites from the bar; when a site is open it says about:blank instead of the URL.
Worst of all - I thought to re-download on the basis I might have finger problems and have set something different, BUT, Opera won't download, the "if it doesn't start" page appears and says 'try again' but it still doesn't load....
Agh!! help please quite frustrating. If I just 'new tab>speed dial>enter a google terms such as Opera Forums it loads......