changed:
-
See WhyDoesEverythingSeemDim

If you are using 'view' in your patch to change the viewpoint, you may not be pointing in the correct direction. 
You also might have translated everything outside of the current viewport.


Also, if you have been using single buffering ('buffer 1' message to gemwin), then you might still be in that mode. 
Either send a 'buffer 2' message or a 'reset' message to gemwin. 
Then, destroy and create your window.