After the upgrading to b21, I'm getting a WebGL error when I try to load the Cesium demo on the main page at cesium.agi.com. It says:
An error occurred while rendering. Rendering has stopped.
RangeError: invalid array length
I'm running Firefox ESR 17.0.9 on Windows 7 with an NVIDIA NVS 4200M graphics card, driver dated 2-22-2013. Any ideas on what the problem may be? I've had issues with Cesium running on versions of Firefox older than the ESR before (which I expected), but this is the first time I've had an issue using the latest ESR release.