[mew-int 3095] How to debug Imap issues

Hello,

I have a working setup for one Imap server, and I am trying to switch
it over to another Imap server.  If I switch the settings in my
.mew.el file and start a new emacs and mew, I keep getting the message

  mew-imap-namespace: Type 'C-uZ' to collect IMAP folders!

I tried to set mew-debug, but that did not give me anything.  So, what
is the best way figure out the problem?

Thanks,
Walter Landry