Use REFRESH to repeat from the beginning. Use STOP to stop on particular "frame"
Skeletons are best viewed in "full screen mode".
To invoked "full screen" select FUNCTION 11 key (F11 again will return to "normal view")
 
If some of the images appear to be just "black" in the middle of the montage, try using BACK from the toolbar to jump to the previous screen, and then use FORWARD to see if now loads successfully the second time.

Montage created by John Martin for gif43