Hi candreu,
I’m the author of Auto ThickBox Plus plugin.
I have a problem with Thickbox and W3 Total Cache. When I active the minify JS, Thickbox doesn’t work. I tried Auto Thickbox and Auto Thickbox Plus, and both have the same problem.
I tested W3 Total Cache with ThickBox, and found the following error has occured.
Uncaught ReferenceError: thickboxL10n is not defined (thickbox.js)
thickbox.js output the <script>
tag before the closing <body>
tag like bellow.
<script type='text/javascript'>
/* <![CDATA[ */
var thickboxL10n = {"next":"Next >","prev":"< Prev","image":"Image","of":"\/","close":"Close","noiframes":"This feature requires inline frames. You have iframes disabled or your browser does not support them.","loadingAnimation":"http:\/\/example.com\/wp-includes\/js\/thickbox\/loadingAnimation.gif","closeImage":"http:\/\/example.com\/wp-includes\/js\/thickbox\/tb-close.png"};
/* ]]> */
</script>
<script type="text/javascript" src="https://example.com/wp-includes/js/thickbox/thickbox.js?ver=3.1-20111117"></script>
W3 Total Cache combines only <script src="">
tag. I think that text data inside <script>
tag should be combined.
Anyway, I modified Auto ThickBox Plus to be compatible with W3 Total Cache. Please reinstall latest version and try it after you empty caches.