problems with glut

I have glut 3.7.6 and also some problems with the GameMode…even with glutGameModeString() i cant change the frequence. Only when i change the frequence settings for direct draw directly via the driver settings it works…is this a kind of bug in glut ?

Another problem with the GameMode of glut is an heavy flickering when i am online via an isdn-modem…when i am offline it is gone…buggy buggy buggy