OK, good to know JS & HTML work.
You now have the following options;
- stick with JS & HTML, forgetting about CSS optimization
- try with "look for CSS in head only" (although I don't think that'll fix the problem, as most CSS seems to be in "head" anyway)
- try with the "legacy minifier" by adding
define("AUTOPTIMIZE_LEGACY_MINIFIERS","true");
to your wp-config.php - look at the HTML without CSS optimization and distill a list of all CSS-files being referenced. exclude one after the other, trying to identify the one that is breaking things (and I'd be very interested in identifying that one to test with myself)
bàt,
frank