It generally seems to occur more if the geometry or billboard is the focus point when holding the middle mouse button down. The actual crash seems to happen when I rotate the camera beneath the ground level. This is on OSX 10.11 and Chrome 45.
The screenshot below was taken after a crash in the Geometry and Appearances sandbox.
Screenshot: http://i.imgur.com/kPMsG8e.png
Error text:
An error occurred while rendering. Rendering has stopped.
undefined
RangeError: Invalid array length
RangeError: Invalid array length
at updateFrustums (https://cesiumjs.org/Cesium/Source/Scene/Scene.js:976:36)
at createPotentiallyVisibleSet (https://cesiumjs.org/Cesium/Source/Scene/Scene.js:1132:13)
at render (https://cesiumjs.org/Cesium/Source/Scene/Scene.js:1723:9)
at Scene.render (https://cesiumjs.org/Cesium/Source/Scene/Scene.js:1764:13)
at CesiumWidget.render (https://cesiumjs.org/Cesium/Source/Widgets/CesiumWidget/CesiumWidget.js:662:25)
at render (https://cesiumjs.org/Cesium/Source/Widgets/CesiumWidget/CesiumWidget.js:68:32)console.error @ Sandcastle-client.js:29
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