I encountered this in a programatic use of Yahoo's User Interface Library (YUI), where it just so happened that I was outputting more than 30 button instances. Each button was outputting a small style snippet to set a background image as per their example. As a work-around, I'll need to come up with a way to collect all of the styles and then output a single <style> tag.
Here is a snippet that demonstrates this bug if this post is opened in IE, or you can place the HTML in a file and load it up separately. I'll post it on Microsoft's forum and update this if I find anything new.
If any span is not green, the style tag was ignored. Span 1 Span 2 Span 3 Span 4 Span 5 Span 6 Span 7 Span 8 Span 9 Span 10 Span 11 Span 12 Span 13 Span 14 Span 15 Span 16 Span 17 Span 18 Span 19 Span 20 Span 21 Span 22 Span 23 Span 24 Span 25 Span 26 Span 27 Span 28 Span 29 Span 30 Span 31 Span 32 Span 33 Span 34 Span 35