Hi,
No known problems with the 0.7.0 D3D9 renderer, although this does not mean much since the code is so new

The issue looks like some render state issue, perhaps related to one of the matrices. This will be something you're changing in your code, that we are not setting back to default or disabling in the renderer - if you want to try and fix it, you can try resetting various states prior to calling the renderGUI function. If you happen find which one is causing the issue that would be great. If not, I'll look into it and try and reproduce something either tomorrow or Wednesday, though reproducing certain issues is sometimes quite difficult.
CE.