Ot: Stacker 4/dos False Out Of Disk Space Issue

I'm sorry for the OT post, but:

Hi! I have the DOS version of Stacker installed on a Win98 mini-tower for the purpose of compressing a ZIP100 disk for networking to a DOS laptop. Now, I have an issue with the disk reporting a Disk Full message. When I write to the disk, I get a General Failure from DOS. I press F for Fail and get a Disk Full message. The disk couldn't possibly be full. :/ I tried copying the disk contents to a hard drive, removing the Stacker volume, recreating the volume, then coping the files back. The first time I did this, it worked. The last time I did this, I got the same problem. Is this a known bug in Stacker? How do I fix it?