I have Gnus set up to get mail via nnimap and it works fine, except for one small problem: It shows all directories twice, once with a slash as the separator, once with a dot as the separator. So I have a list that looks roughly like this:
12: Test/INBOX/Stackexchange *: Test.INBOX.Stackexchange
The directories with a dot as the separator are not subscribed, so at least I don't always see them, but they also cannot be opened (Emacs says they do not exist) and so they're pretty annoying. Is there a way to get rid of them? Maybe I need to delete some sort of cache to fix the problem. I tried gnus-group-clear-data-on-native-groups, but that didn't help.