Mailbox locking in RHES4?

[Bernd Bartmann <bernd bartmann gmail com>]

Hi,

I did a fresh install of RHES4 on my server which formerly had RHES3
on it. My FC3 client mounts the home dirs via NFS from the server.
When trying to open a mbox mailbox with mutt now I see a message:

Waiting for fcntl-lock...

counting up from 1 to 4 and then the mailbox file is opened. With my
old RHES3 system the mbox files were opened immediately. What could
cause this problem?

Thanks in advance,
Bernd.