Thanks for the tips, Carsten. Sadly, the debug output doesn't yield 
anything obvious (attached if curious). Also, tracing back through 
code, it's directly related to the Window::render(RenderAction) 
routine. I have a meeting to go to now, but will be digging in a little 
deeper this afternoon.

Thanks again

E.

p.s. also updated my drivers and OpenGL headers to make sure I'm current.

Quoting Carsten Neumann <[EMAIL PROTECTED]>:

> Carsten Neumann wrote:
>> Eric Maslowski wrote:
>>> WARNING:
>>> (c:\projects\dev_opensgbuild\opensg\source\system\action\renderaction
>>> osgrenderaction.cpp,2301): RenderAction: precheck failed: invalid value
>>> (0x501)
>>
>> Hm, the message is not very helpful, it seems your glu library does not
>> know the error number 0x501, but maybe you have a chance to look it up
>> in your gl.h header to get an idea whats going wrong.
>
> oops, sorry, I just looked into my gl.h header and found that the error
> number 0x501 just means some invalid value was passed to an OpenGL
> function. Do you get any other log messages (try setting the environment
> variable OSG_LOG_LEVEL to DEBUG) that indicate problems ?
>
>       Carsten
>
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