I have been away a few days so I did not test right away.
RC0 - gives black screen just as reported, as did subsequent debug versions. The version labelled "debug_with_dump.7z" initally loaded DWM in a way that seemed normal, but interacting with the taskbar caused the black screen - the screen that went black was the screen that the taskbar was interacted with, while the other screen did not change graphically but mouse inputs were ignored. Was possible to use F11.
In the latest version that generates a minidump, callBlurShapes=0x1 seems to allow things to work again, and so far I do not see the presence of artifacts, and it is currently performing well. I reloaded DWM so I think I might have to restart explorer for the taskbar to colourise properly. I will keep running and report any additional problems later.
I can provide the logs but are they still needed? You have had a few people provide logs so far and the callBlurShapes "fix" seems to currently sorted some issues out. SO if the minidump is not needed, I can still provide the other logs. Since the minidump is over 100mb, it will take a long time for me to upload. I will do so if it is still needed.
Edit: Just to mention (again) that I use an nVidia card (GTX570) and the driver version is 320.00.
Edit: Here are the links to the other logs and the minidump once it finshed uploading.
Minidump: -No longer needed
Edited by drakenabarion, 12 May 2013 - 11:36 AM.