Hi Keith,
one reason, the screenset file gets corrupted is when editing a script within Mach3 and saving it after MachScreen was terminated. If MachScreen shows only the property dialog you can try the following:
to investigate that issue, it would be very helpful, if you would:
Run Regedit.exe
Export the following key: HKEY_CURRENT_USER\Software\KD-Soft\MachScreen
Make sure, the file ending is txt
Send me that file per Email
To get MachScreen in normal mode again:
Terminate MachScreen
Press the Shift key and hold it down
Start MachScreen
Keep the Shift key down until MachScreen shows up.
Regards
Klaus