Errors accessing shared speadsheet.
 

I have a group of users who access a shared Excel spreadsheet. The
spreadsheet is on a Novell server. Starting out they all could access the
spreadsheet fine. Starting recently people have begun to receive memory
errors when accessing or saving the spreadsheets. If you log into windows as
a different user but still use the same ID in Novell it works fine for a
period of time then recieves the same error. This seems to be a microsoft
issue as after you recieve the error you can copy the file local and it still
errors. logon as a different user in windows and it works fine. any help
would be appreciated. Thanks,