I've been trying out the free version of A7.

While workign in MED i place a cylinder and after selecting faces on one of the flat round sides I click the extrude button, enter a value into the extrude distance pop up window (been using values from 5 to 8) and click OK. MED then 'hangs' for a few seconds then I get the windows pop up window stating MED has stopped working then MED completly shuts down on its own.

I'm running Vista and had to use the 'Disable compatability' under MED properties, because before i did that the view windows would go blank white every time I added a primitive or box drag selected something. Could this 'disable compatability' be causing it to crash like this?