>>That's exactly what we've done. But, we're still experiencing the problem. However it's not consistent - it occurs only rarely. But when it does occur, it occurs in code that's executed A LOT - but usually executes OK! Then, a few times a day we get these oddball errors.
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>The only my guess is that for some reason your application cannot see the directory where this prg file resides. In your onerror routine check whether this directory is in the application set(“path”) , and if it is there, then check for existence of this file.

The directory exists and so does the file. The only thing that doesn't exist is the drive. The correct drive and directory is on the path.