Hi can't help much but I also get this error in my code, but this is my first J3D program so I think I could do it cleaner and avoid it. I have a few views in a tabbed swing panel and a menu which allows me to add additional tabs with new views. I can start the program with 1-8 tabs ok but if I add more then about 4 new tabs during execution it throws the error. (each view contains a new simpleuniverse with upto 300 spheres with textures and a pair of light sources). I'm just testing ideas and performance at the moment. *HOWEVER* I did find this listed as a bug on the java.sun.com site and it's meant to be fixed in Java3D 1.3alpha1. Check the site for more info. I suspect I'm overloading the render with too many objects and should just create one Universe and make the views differant subgroups of the scene, that's my guess anyways. :) Good luck! Jason. =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".