So I found out this issue when in DX11 mode when using Cubemap Actors. Here are some pictures to illustrate the problem.
DX9 Cubemap Actor with RenderTargetCube assigned.

DX11 Cubemap Actor with RenderTargetCube assigned.

DX9 Static Cubemap from same Cubemap Actor.

DX11 Static Cubemap from same Cubemap Actor.

So the problem is easily seen, and this is fixed right after I switch back to DX9, so it has to be some sorta issue having to do with UDK in DX11. Note that this is the November 2011 UDK (Latest), and I am on Windows 7 Ultimate 64 bit.
If there is any more info you need, don't hesitate to ask!
Edit1: Also the settings for each actor are exactly the same.
DX9 Cubemap Actor with RenderTargetCube assigned.

DX11 Cubemap Actor with RenderTargetCube assigned.

DX9 Static Cubemap from same Cubemap Actor.

DX11 Static Cubemap from same Cubemap Actor.

So the problem is easily seen, and this is fixed right after I switch back to DX9, so it has to be some sorta issue having to do with UDK in DX11. Note that this is the November 2011 UDK (Latest), and I am on Windows 7 Ultimate 64 bit.
If there is any more info you need, don't hesitate to ask!
Edit1: Also the settings for each actor are exactly the same.
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