Caption background issue in IE8

[Alex]

Captions fade in from right or left but sometimes the caption black
background will disappear before the slide transition leaving the text
caption on the slide without a background. Any ideas?

[Cristian]

I'm not sure if we had the same problem, but I fixed mine adding a css
style to my problematic element, that is " left:0 ". (It made the
caption background stop at the end of the animation.)

Since you said you have some slides working, if my trick did not work,
you can try comparing the css for the slides that work with the ones
that don't.