Select failed, server replied: A000123 NO Character not allowed in mailbox name: '.'

Hi,

somehow subfolders don't seem to work anymore with my IMAP-Account.
Whenever I try to change something (move a mail, create a folder, etc.) I get 
the following message from the IMAP server:

Select failed, server replied: A000123 NO Character not allowed in mailbox 
name: '.'

I'm not sure since when the problem is there, but I think since the upgrade to 
4.8.0 (I'm using 4.8.2 now)

Any ideas what's the problem?

Regards,

Stephan
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