Even the old ones are working now. I have no idea what changed. I haven't rebooted more than twice and it wasn't working on the last reboot. The only thing that I can say has changed is the old tabs have been moved and snapped into position. So maybe it was that the old tabs were positioned using the shift key.
Oddly enough, it's working now without the purge, but there are some fences it doesn't work with. If I create new folder fences, I can set up tabs, but with earlier ones I set up, it won't work. The differences seem to be that the earlier fences I set up, I used the shift key to position them very accurately.
Tabs for folders don't work. There is no popup. menu.
I just purchased and installed the latest version of Fences 6. I had to install twice and reboot twice. When I try to create tabs from existing fences, all that happens is the fence I drag onto the other fence just covers it up. So now I have two fences in the same place but one is obscured by the other.