Novell Client 2.0 SP1 for Windows 7 (IR1)
If the workstation sits for 5 minutes then they are able to click the button and see the contexts.
This problem is only encountered when the SLP/DA is running on Netware.
Install an updated SLPTCP.NLM. The patch is available here: https://download.novell.com/Download?buildid=3jTAJ9OIQAQ~
After installing this module, running "modules slptcp" on your NetWare server should display as "Version 2.13.00 Wednesday, June 24, 2010".
The Open SLPDA that ships with SLES and OES does not exhibit this problem. A workaround would be to create an A record in the DNS server for the "Tree Name" pointing to a server in the Tree.