Something very strange is happening on my system. After adding the code to fix the full screen mode (mentioned above), but NOT disabling DEBUG - which means that the code should NOT be compiled and therefore should make no practical difference - the game
Yes, the C# Express IDE showed the new code as greyed out.
The only difference between then (when it didn't work) and now is that my XP Professional system has been rebooted.
This PC has been running for years and has been in a production state all that time. Something tells me that something is not quite right with this IDE!