V5R2 upgrade - Word 2000 errors while saving to mapped drive

[infosys@amm.org]

We upgrade our server and clients to V5R2 iSeries Access Express. Our Win 2000 clients are fine, but the Win NT clients get an error "The disk is full or too many files are open" when trying to save Word 2000 docs to mapped drives (shared folders) on iSeries. However, you can save to your hard drive and then copy to these same shared folders. Strange.