Two bugs actually. Here are some facts:
1. Pressing AltGr + 0 (which is the } sign on our swedish keyboards) calls up the background tasks window.
2. Keybord shortcut for background tasks is set to ctrl + alt + 0. So this is essentially correct. Its just a really poor choice of shortcut key for us I guess. Removing the keyboard shortcut solves the problem.
3. There is a focus problem with the backg. tasks window. You cant toggle it.
A. Call up the window with ctrlalt0
B. Close the window with ctrlalt0 (Does not work)
C. Click on the editor to focus it (the backg. tasks window is still open)
D. Close the window with ctrlalt0 (Now it suddenly works)