New Release 1.5.3 available

[dgud]

Set OpenCL proxy level to 3 (for testing) otherwise 2 is good enough for large models.
Create a cube and press SHIFT-TAB should give you a sphere.

Otherwise open the console window and see if you get any output regarding OpenCL?

You should not need to install anything else than good graphics drivers,
only if you are a developer should you need to install additional drivers.

On mac (and on some linux) depending on graphic cards add:
{cl_type,cpu}.
to your preferences file.