CUDA 7.5 & UBUNTU, device code background color not working

Hi,

After installation of CUDA 7.5 on Ubuntu 14.04 I noticed, that syntax coloring does not working properly. The Device Code Background color is always white, despite I set it to light yellow. I noticed the same problem on two installations, both on Ubuntu 14.04.
Does anyone has the same problem ?

Best regards,
Andrej