Hi
It happened when dragging a video to powerdvd 11 or dragging a picture to photoshop CS5.5, every time since i installed 11.5 (about a week) but it seems to have stopped doing it since last night i can't get it to happen again, except it still happens for windows log on and log off/restart.
I don't know what other icons would make this happen as have only been dragging to PowerDVD11 & photoshop.
I even tried deleting the icon cache with CCleaner to see if that made a difference but it still won't happen again, only happens now in windows restart/logon.
If i unistalled the dock and re-installed it then i have a feeling it would start happening again (i didn't try it yet).

EDIT: i just uninstalled the dock and re-installed and it still only happens on power on/logon so whatever was causing the slow loading of icons when dragging to PowerDVD11 ,Photoshop CS5.5 seems to have fixed it's self, but it still shows blank icons at start up/log on.