Microsoft is now pushing out its latest and greatest Internet Explorer 9 through Windows Update. Immediately noticed some problems on some sites with default serif fonts appearing in unexpected places.
The F12 development tools didn’t throw much light, suggesting that the element was correctly inheriting Arial. Turned out to be some empty style rules tripping up Trident, the likes of:
font-family: ; font-size: ;
Removed, and all was back to normal.