[PD] glsl geometry error "GL: invalid operation"

[sleeping birds]

hello kind pders,

i have trouble figuring out, why the 10.geometry help-patch does not  
work for me.

starting rendering constantly prints out "GL: invalid operation" to  
the console.

i tried finding out, whether it was a limitation of my gpu, but don't  
think so since i am using a Nvidia 9600M GT on a macbook pro (and once  
saw a list somewhere, where the opengl version and features where  
listed).

as of today, i am using gem 0.92.2 within the pd-extended nightly  
build from the 16.12.
(i tried the official release and lots of older nightly builds as well.)

anybody else with this problem?

thanks in advance for any suggestions.