Hello Peter
In the German version, the shortcuts are really cmd + alt + (key +)
and cmd + alt and (key -)
Here they work flawlessly when the keyboard is the German one.
No need for extraneous modifier key.
I must add that it seems that there is something playing the fool with shortcuts.
When I work with 10.7.3, a Mail shortcut (cmd + shift + U) is inactive and I was forced to create an alternate custom one (cmd + alt + U).
Yvan KOENIG (VALLAURIS, France) vendredi 6 avril 2012
iMac 21”5, i7, 2.8 GHz, 12 Gbytes, 1 Tbytes, mac OS X 10.6.8 and 10.7.3
My Box account is : http://www.box.com/s/00qnssoyeq2xvc22ra4k