I have the same problem with GED 0.12 in Gamestudio A7.77 and A7.80 Com.

When I try to load any level in GED 0.12, I get the following message;
'Please wait... Loading Level in Engine. 100%'
For a second I see the level on the left, but the GED window is frozen.
The only way to terminate GED 0.12 is to close it with the Windows Task Manager.

For information: GED 0.11 works on my PC, but not GED 0.12.
My system: Intel Core 2 Quad CPU Q6600 2,4 GHz, NVidia GeForce 8600 GT, Windows XP Prof. SP3

GED is a very interesting tool and I would like to use it.

Is there already a solution for the problem that GED hangs after loading any level?