Please try this yourself. I'm using the exact code and model from the litec_samples.zip file.

I am using the trail version of the engine from the downloads page.

I'd also like to note: it is using a function (not by my design, this is how the code came) with a wait(1).

It has nothing to do with bones, the same problem occurs if you simply try to loop the animation, it fails after 2 loops or so.

I tried this on both my laptop (Vista 64x) and Desktop (XP 86x).