Wrong Opera Icon in Gnome Shell

I am using Opera 11.60 on ArchLinux (64bit) with Gnome3 and KDE4. Since I installed KDE4 last week Gnome3 shows the wrong Icon for Opera in the upper left corner and in the task switcher (alt+tab). Here is a screenshot of what I see: Does anybody know how to get the correct icon and title back, as it also says "opera" instead of "Opera" (capital "O")? I already tried reinstalling and removing my .opera files but that did not help.