It was just reported that we had a warning for the zim_three module that it was importing multiple copies of three.js. This was because we had left a ? on the end of the url in three_shim.js file from some testing. So that is fixed.
However... it is a month after launching and we should have caught that earlier. If you ever see something that is not quite right, please do not hesitate to let us know in Bugs.
Cheers.
PS - thanks @Gloria for the report.