I have trouble to use Ctnl+U (View Artwork full Size) and Ctnl+L (View this Release at MusicBrainz).
At the start of Jaikoz (3.8.3) it works fine, but after a while working with Jaikoz these key-strokes doesn’t work anymore. 
I have to exit and start Jaikoz again to get these functions to work again.
When using the context-menu “View Artwork full Size” and “View this Release at MusicBrainz” there is no problem.
I don’t have any trouble with Ctnl+Alt+Shift+L (View this PUID at MusicBrainz) and other shortcuts.
Ctnl + U and Ctnl + L doesn't work all the time
Same problem here, im using CTRL+L, not working all time. But i click on view > show release and works again
@pschonmann
you’re right !!!
After View -> Show View Pane and back, the shortcuts are working again. Utill the next time during the working session, when the function is gone away again.