hi there,
I installed one app which went fine, then tried another and the dialogue you see after a app is installed ( close <>run ) , on the second install disappeared after I clicked close but somehow refresh caused window remnant to remain, and after a few seconds entire packagekit window turned white , but rest of desktop was functional. I found no other threads on this so Im posting this, albeit I have no errorlogs as it didn't crash with any, just hung.
This was after installing updates last night and rebooting.
cheers
nl