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Hi everyone...totally new here, but have searched and searched online with google yahoo etc...and i keep getting brought here, but no one seems to mention my specific issue, which i'm hoping is a good sign and implies that i'm probably just doing something wrong.... Anyway, i just got LDD and have been playing around with a very simple geared design to start with...and for the purpsoses of keeping it simple, let's keep my problem to it's most basic...i have 2 axels running through a technic beam/crossbar (the one that are just like bricks with studs on top and the holes along the side length of it....the axels in tis example are spaced with 2 empty holes between them and both have the same 24T gears mounted and the teeth are visibly aligned (don't even know if this is something i need to worry about or if should happen on it's own), but when using the hinge tool to test the motion, when i grab the "driver" axel and gear and turn it, the connected gear and output axel DOES NOT react, as if the two gear teeth were not engaging properly, but they are...there are no additional pcs impeding the free movement of the gear or the axel to which it is mounted. And just to test, i tried using the intended output axel/gear as the driver with the hinge tool and even though it moves perfectly with the tool, the engaged gear won't leaving it's axel and everything connected completely without motion.... I have checked looking for settings to see if this is something to be turned on or what....but with the hinge tool i can otherwise simulate all the movements of everything else connected ....just not at any point where there are connecting gears... am i doing something wrong? I'm on a mac 10.6.8 and have just downloaded the ldd from lego's site within the last week so it's the latest.... And again a reminder that i'm new so please any help should be complete and addressed for an LDD layperson step 1-whatever the final step is...this would be very much appreciated, thanks!