Indigo RT - GPU not working - Black Screen

[Asterix7]

I just bought Indigo RT - unfortunately I should have tested it upfront. It works in CPU mode, but it gives a black screen on GPU Render mode.

Indigo RT version 3.0.10; OS X 64bit
file used - caterpillar5.igs
render settings (see also attached screenshot):
- halt time -1
- halt SPP -1
- Enable GPU; ATI Radeon HD 6750M (OpenCL)
Device info =
Device nr 0;
Mem Size 512 Mb (wrong is 1024 Mb);
Core clock = 0 Mhz
Compute units = 5

GPU Accel for Core i7-2820QM CPU (OpenCL) works - rendering takes 2-3 minutes for grain to disappear

Please advice
Many thanks

[Zom-B]

This is also the first GPU based OSX build, so there aren't all possible issues known and fixed atm.
In the console there should be some error report, this could help.
GPU informations are reading always the half memory, since afaik only the half amount of RAM is usable (driver restriction!?)

If somehow possible on OSX, update your GPU drivers, thats the best medicine, since OpenCL is quite fragile on the driver basis!