Also happens when you change a resources' template...
The fix stoppoed the messages popping up but the resource editing pages don't show up in the manager now. You can see the resources in the resource tree on the left, but when you click on them the right panel is blank. The elements seemed to be OK though.
I removed the fix and the manager works again but obviously I have the pop-up messages back.
Will upgrade to 2.2.12 I guess. This must have just come out as I only downloaded 2.2.11 a few days ago. Seems like 2.2.11 was buggy from what I read.
Cheers - zaphodx