[imp] The folder "0" contains illegal characters in its name.

[Andy Wright]

Using CVS Head.

I have switched over to Dovecot IMAP from Courier IMAP. Although 
everything is working fine, I am seeing the following error in IMP on 
all folders;

The folder "0" contains illegal characters in its name. It may cause 
problems. Please see your system administrator.

Any pointers where I might start looking?

Andy.