FOUC fix causes empty slide

[sawmac]

I just tried out the new CSS file with FOUC fix. I've only tested in Safari, Chrome, and Firefox on Mac, but this fix causes an empty slide to appear momentarily when you reach the end of the slide show and move back to the first slide.

[Mottie]

Thanks for bringing this to our attention... silly me for not testing it ;)

Updated fix in version 1.7.11.5