NetWare 6.5 (all latest patches available), Windows7 (all latest patches available) and "Network security: LAN Manager authentication level" on Windows7 set to "Send LM & NTLM - use NTLMv2 security if negotiated".

After mapping a a drive to NetWare:

net use n: \\\data /user:accountname

... choose Start/Computer and under "Network Location" find server1. Double click on server and navigate more than three folders deep (any folders), watching the path url build in the path bar that is located to the left of the right/left navigate arrows at the top of the open "Computer" window.

Now, after selecting the word computer in the url path bar, a highlight color will start to paint in the url path bar and Windows Explorer will go out to lunch for ~ 30 minutes.

This issue also appears when the Novell Client v2_SP1_IR1 is even installed.

Thoughts, because one Windows Explorer goes out to lunch, the only thing that clears the issue is a reboot.