Apparently they say this can be fixed by changing the extension to gz.css instead of css.gz... Dunno. Can anyone test this, if you know how to change it..? I really don't want to install a pirate copy of Windows 8 and update ie11 on it just for that... (Because yes, I have no plans to upgrade from my legit Windows 7! And Microsoft doesn't offer an iso of win 8 for ie testing... Color me surprised...)
Alternatively, I could simply disable gzipping on IE11 (including on platforms where it isn't buggy, e.g. Win7), just tell me what you prefer guys...