stoneMcClane

Turns out that the only thing that was different between the original code and my SlimDX port was at fault for the issue

To run the message loop for the application I simply used the SlimDX message pump on the first window...

						MessagePump.Run(g_WindowObjects.First().Form, () =>
						{
								RenderToAllMonitors();
								PresentToAllMonitors();
						});

... but this seems to have interfered with something that DXGI is doing during the fullscreen transition of this window.
I replaced the above code with a separate message loop (just like in the original sample code) and after that change it worked as expected.

I've put the whole code of the port to my bitbucket account so if anyone happens to need something like that, feel free to go there and grab it.

https://bitbucket.or...imdx_multimon11

[Update]

As said I've now tried to create the windows in the exact same way the DX sample does it by using PInvoke for all necessary W32 calls ... the behaviour stays exactly the same as when using .NET Forms.
So I guess the issue might be related to either SlimDX or the .NET runtime is doing something which causes problems ?!

I'm kind of lost here right now, what else could I try to narrow the problem down ?