During a system update i found out that i could no longer switch focus between windows that are grouped in the panel. When clicking on the grouped window and in the menu choosing what window to focus nothing hapens. *This only affects grouped windows* single instance windows in the panel works as it should though.
However this have left me to that i need constantly to ALT+TAB to the window if wish to focus. There's a workaround though by disabling the window grouping.
duplicate of bug 7383?
*** This bug has been marked as a duplicate of bug 7383 ***