Here's an odd one. The following code returns two different answers, even though they should be identical:

****************
* The following code makes vp_dbfname = ""
****************
iif(EMPTY(thisform.ctextbox1.Value),vp_dbfname = "", ;
vp_dbfname = thisform.ctextbox1.Value)

****************
* This code makes vp_dbfname = thisform.ctextbox1.Value
****************
if EMPTY(thisform.ctextbox1.Value)
vp_dbfname=""
else
vp_dbfname = thisform.ctextbox1.Value
endif