I’m going to try some of these suggestions…nosniff sounds promising.
These were the suggestions I was going to try
IE9 tries to download even regular css files, but this seems to ensure that the styles are applied to the page:
header( 'Content-Type: text/css' ); header( 'X-Content-Type-Options: nosniff' ); header( 'Expires: Thu, 31 Dec 2050 23:59:59 GMT' ); header( 'Pragma: cache' ); echo( $style ); exit;
Ok, I’ve found the problem:
WordPress wraps p tags around my shortcodes and since I’m using block elements in my form (and shortcode) I’ve and block element inside a block element – which isn’t allowed.
Removing the surrounded p’s solves the problem.
This took my about 10 hours of my life!