The lastest version of Opera - 53.0.2907.68 - with tab preview does not work correctly. When hovering over a tab that scrolls down a little, the preview window does not display correctly. This works perfectly in previews versions - Opera 52.x.
- Open http://forum.opera.com
- Switch to another tab.
- Hover the mouse over the old tab.
Hover the tab:
It have a cover panel in bottom.