[Plugin: W3 Total Cache] JS minifying stops picbox from working in IE8

Not all scripts can be minified. You may need to try combine only or otherwise remove the relevant script from your settings.

Somehow I got it working, though I don’t really know how ??

If you could double check and let people know that would be nice.

One thing I noticed today is that minifying google analyticator causes problems. Another time it also helped to move jquery to the top of the minifying list.

Indeed jQuery should be at the top of the list. If you use the minify help tool, it would catch that by default.