Issues I'm getting in cesium's startRenderLoop

I currently can add 1 or 2 CzmlDataSources to my application, but anything beyond that (or when I press the ‘home’ button) throws the following error in Viewer’s startRenderLoop function.
DeveloperError {name: “DeveloperError”, message: “q0, q1, s0, and s1 are required.”

I’m also getting the following error thrown in that same function when I try to morph to 2D or 2.5D views.

RangeError: Invalid array length

Going through the stack trace leads me to believe there’s a time parameter not being set @ Spline.prototype.findTimeInterval… but I’m at a loss for what to do at the moment.