Hi Gerard
We have not experienced the same problems, it might be the fullpath() command, Anyways, here with sample syntax:
with thisform
_vfp.autoyield=.f.
.zip.zipfile ='test.zip'
.zip.itemlist=fullpath('Files*.txt')
.bar1.update(0)
.bar2.update(0)
.zip.actiondz=4 && Go & Create Zip
.bar1.complete
.bar2.complete
_vfp.autoyield=.t.
endwith
HTH