Same here... I thought I was banned for some unknown reason??
I click on the research group and bring up a list of threads I posted to. When I click on them; it gives an error: you don't have permission to view this item...
There was absolutely nothing done to the threads. Just being able to view them. Please refresh your screen a few times.
They are all there. And unless I start doing mass deletions, there is no way for several to see them and you to see only part of them.