Viewport glitches using the UDK Material Editor and DirectX 9

[billbea]

Hi,

When running the UDK Editor (October 2011) using DirectX 9, I have very annoying viewport glitches when using the Material Editor.

This makes it almost undoable to edit materials.

Turning of the Real Time Viewport solves it a bit but not fully.

Does anyone have similar problems and/or know how to solve this?

I'm using a laptop with a GeForce GT 555M

PS Running in DirectX 11 solves the problem, but I would like to be able to run in DirectX 9 mode as well.

[Graylord]

Can you describe what the glitch actually is?

[billbea]

Glitches mean that when I move the network around (or even hover my mouse over it), or try to rotate my object in the Real Time Preview of the Material Editor. The preview and/or network quickly switches from window to window within the Material Editor but also the main editor, making it impossible to work.

Is that clear?

[billbea]

Update

The flickering occurs when the Real Time preview is turned on, being it the main editor and/or the Material Editor.