When I attempt to open any .set file with Screen4, I get as far as choosing a resolution.  Immediately after I choose a resolution (any) a small box appears with a yellow triangle symbol with an exclamation point in it.  Just below that is an OK button.  No matter where I click after that, nothing happens.  Only way to close the program is through ctl-alt-del.  This is on three different computers, one of which is my Mach3 control box.  I can open the .set file with the old screen designer.  I have re-downloaded Screen4 in case of a corrupted file.
Any suggestions would be greatly appreciated.
Donn