Alright, this is actually a C5 bug, but I finally got around to making a vid. So, if this is fixed in C6, please ignore. If not, please fix.
I forget what causes the ERROR: Some files were not deleted! dial box in the pool when emtying the trash - phantom files, perhaps? Has something to do with duplicates…not sure. But in any event, that is not the bug. The bug is not being able to click when that box appears.