One part of the improvements in SP1 caught my attention:

"Parameters passed by empty placeholders default to NULL instead of .F. "
http://msdn.microsoft.com/vfoxpro/downloads/VFP7_SP1Readme.htm

Will this cause problems with backwards compatiability? I have lots of code that checks to see if parameters are logical or empty to make sure they were passed, and if I read this correctly, that code is now broken in all my COM objects?