I'm also struggling with a similar problem. I Have a new 8core Macpro with standard ATI HD5770. Using two DHTG digital edition there is no problem. It is limited to 2560pix.That's is why we changed to the dp edition. This where things started to go bad. We are driving three microtile walls and one projection. I'm not able to get an image after start-up. But it is funny that true screensharing I can see the that the MacPro sees the DHTG and expands the desktop. But no image on the microtiles /projection. When I connect a monitor on one of the outputs, the DHTG goes active. Swap the microtile back and things get finaly to work for one the two DHTG. After some trying I get both DHTG to work. But never from the first time. I need to put a monitor first to get this to work. Any Ideas?


Gilles