Heres a one sprite capx:
Except in 103 it doesn't seem to work in FF and IE - as you resize the window, the left edge jumps around and is generally too far left, and sometimes the entire sprite disappears (and then its gone until you refresh the page), and sometimes it wraps, and sometimes it even produce two half height sprites!
Id seems pretty broken - or I'm doing something pretty stupid!
I also tried it with webgl switched off - didn't help. Ive even updated my graphics driver to one issued about 2 weeks ago from nvidia.
Some screen shots (the box should be centered on the screen with the same gap on the left and right hand sides.