Mounting Novell-Shares with ncpmount does not work after update from 10.10 to 11.04

In Ubuntu 10.10 (Maverick), I used ncpmount to access my company's Novell-NetWare-Shares. That worked very well. Today I updated to 11.04 (Natty) and the whole mountpoint seems to be stuck.
When I cd to the mount point and try to list my files with ls, the console hangs (Strg-C does not help, waiting does not help). Once the bug even managed to kill my whole system and I had to reboot.
Opening the mounts in Nautilus results in an empty window, not responding any more.

I tried to reinstall the ncp packages and to manually remount the shares - nothing helped.

I hope very much, this problem will be solved soon. Do you have any hints what I could be doing wrong?