I work in WPx5....back and forth with my assistant....today when I try to save a document to her work directory....or even mine....I get the error message "out of disk space" it doesn't matter where I try to save it....look at computer properties and there is plenty of disk space HELP
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Can your assistant save to her work directory using WordPerfect X5 on her computer?
If she can, I believe the most likely cause is that the disk drive containing your Windows temp folder (usually C:\) is running out of free space (as mentioned on the page that lemoto linked).
If she also can't save to that folder, it's possible that WordPerfect is misreading the available space on that disk (although I haven't seen this issue in a long time). How much space is available on the disk?