>I am trying to make one of my Form Classes Modal by simply selecting 1-Modal from the WindowType Property drop down in the Other tab of the Properties window. However, everytime a select Modal it doesn't do it [the selection re-sets to 0 - Modeless]. The thing is that I had this selected as 1-Modal previously but somehow it got re-set to Modeless and I can't seem to put it back to Modal. Can anyone give me some direction here?

You set the modal (or modeless) at run-time when you create an instance of the form:

loForm = NEWOBJECT("FormClass","FormClassLib.vcx")
loForm.Show(1) && To make modal

or

loForm.Show(2) && To make modeless