Vista - Offline files - Server is available, but Windows thinks its offlin

I have been using offline files for a while, but I have noticed that over the
past few months when I get back on the network Windows doesn't recognize the
server as online. I can ping the server and get replies, and I can get to it
through the IP address, but the NetBIOS name takes me to the offline version.
Any ideas why this might be and how can I get Windows to recognize the
server?

I have tried flushing dns cache (ipconfig /flushdns) and clearing &
reloading the NetBIOS cache (nbtstat -RR), but that didn't resolve the issue.
I have also searched through the internet without any luck.

This is annoying because I can't access the folders that I haven't marked
for offline availability on the same server.

Any help would be greatly appreciated, thanks!

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