NFS: Processes marked "in disk"

[Namik Dala]

I've upgraded to 5.2-RELEASE last days. Now NFS seems to be
broken. There is an NFS server and 2 NFS clients. The /home
partition is shared. If I start mutt on an NFS client it wants to
read the default mailbox (over NFS) and hangs:

$ ps -auxww | fgrep mutt
namik 71553  0.0  1.0  4221 2312  p7  D+    1:50AM   0:00.75 mutt

Is this a known problem? And is there a workaround?

						-Namik-