WAG- Where is your temporary file directory?

>I am getting an error message in an application written with VFP6SP3 when it is run on Windows 98 over a Windows NT network. When a user makes a change to any edit box that is bound to a memo field and then tries to leave that edit box, an error message that says there is not enough space to save the changes occurs. However, there is more than enough space avaliable on the network drive (approx. 15 gigs). I've explored several possibilities from Microsoft's Knowledge Base with no luck. What makes this most discouraging is that if one uses the MODIFY MEMO command from the command window and makes changes to the same memo field, then no error happens. I'm sure I must be missing something, but do not know where to look next for a solution. This error does not occur in Windows 95, should I just have the users go back to Windows 95? Any help, suggestions, or guidance would be most appreciated. Thanks in advance for your help!!!