Hi and thanks for your reply!
Yes, winbind is installed, and my /etc/nsswitch.conf has wins in the hosts line:
I had been to that route before, but maybe your more skilled eyes can find something worth changing in this file...
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.
hosts: files mdns4_minimal [NOTFOUND=return] dns wins mdns4
protocols: db files
services: db files
ethers: db files
rpc: db files