After upgrading Starcraft 2 with Patch 1.5.0, the German users might suffer from problems regarding the raster grid hot key layout.
One significant difference between the German and US keyboard layout is the swap of characters
Y. The update to 1.5.0 leads to a not working
Y hot key.
According to teamliquid.net bug #23, there is a work-around. Just add the USA keyboard layout to the keyboard layouts options menu. It's not necessary to activate this layout. Finally restart the game and the raster grid layout works again.
This work-around was successfully tested with Windows 7, 64 bit.