showing new mail

[sigi <dugongs@xxxxxx>]

Hi, 

since I updated mutt on my debian-machine to version 1.5.18, it 
doesn't show if there has new mail arrived anymore. 
To describe it: usually I start mutt, hit 'c' and mutt shows me my 
subscribed mailboxes and marks the ones with new mails in it with a 
'N' besides it. 

But now it doesn't do it anymore. I can only watch out for new arrived 
mails by checking the last-updated-timestamp in the mailboxes-list. Is 
this a bug, or am I missing something in my .muttrc now - which works 
for me since several years now? 

Thanks for help,
sigi.