Installation: Windows 7 WS, Netware 5.1 server (10 users only)

Installed SP2 IR4 yesterday and immediately noticed that some files and directories which were previously accessible were now not available. Problematic, looks like rights were messed up. For example, backup files for storing Quickbook backups on NW5.1 server were no longer accessible, kept getting an error that I could not backup the company file.

Removed IR4, reinstalled IR3 and all is well.

Is there something going on I should know about?