Do not shown styles in IE9

that’s probably because the total amount of aggregated CSS was just too much, older versions of IE indeed choked on that. you can always exclude one or more CSS-files from optimization to work around that.

hope this helps,
frank

Had some time to look into this some more and can confirm my previous quick assessement;

The CSS-file is 1.2MB (but goes over the wire compressed to 262.8 KB). That size is not the problem in/ of itself, but the amount of CSS rules (14556 according to this JS-based counter, 9704 according to my browser’s style editor) will be, cfr. this stackoverflow answer for more in-depth information.

So if you need this fixed (because although IE7/8/9 are no longer supported by MS IE 8 and 9 still have market share) you should either disable CSS optimization or exclude some of the CSS, for example:

font-awesome.css, plugins/ubermenu/, plugins/gravityforms, reset-bootstrap.css, tmf-shortcodes.css, store.css

this will require testing though, as this changes the order of loaded style rules, which can lead to inconsistencies.

frank

Thank you