Hi and thanks for this nice nullDC version.
I found a strange way to fix the shaddow problem. If you diasble the "Auto hide Menu" option and open a menupoint,
you can play with normal shaddows and no errors as long as you dont close the menupoint.
This works on my Win7 x64 with 1.0.4 r150.
Maybe someone can use this info to fix the shaddowproblems.
EDIT:
OK, i have upgraded my PC to Win 10 and now this wouldn't work anymore.
No idea why.
http://noerg.net/kram/SM_1.jpg
http://noerg.net/kram/SM_2.jpg