Ops!! That does not sound very good for us. But am am sure you'll find a way around it.

I went to try and test this, and I must have done it wrong.
Yet my test yielded yet a different but still important result, so it seems I have encountered yet a third limitation to CSS in IE (first one I read about on the web was @import being 32 max declarations per sheet and nested 3 deep max, 2nd is this one).
I'm not sure if this is specific to the situation, but it seems like IE will only allow a selector to be declared 4096 times (or 1024*4)
I did the test by declaring "#i{color:#000000;}" and incrementing color by 20 for each line to account for each character / byte [Windows CRLF is 2 characters]. I then made a test element with the same ID on the test page, and placed an onload alert event pointing to a function that returns document.getElementById("i").currentStyle.color;
Thinking about this while I typed this comment, my stylesheet is extremely sparse and hits 80k. Perhaps you too hit the 4096 declarations limit?

I agree. I read in the MSDN website that when adding CSS rules in a style object by JavaScript, after the 4096th rule, Internet Explorer will display and exception error and the should-be-added rule will not be added. I think that is the reason why some web developers thought that there is a file size limit on a CSS file -- I would rather test later with more than 300k CSS file and just about a hundred rules, so that I could find out if there is no really a file size limit in a CSS file.

Furthermore, I had just tested having more than 32 styles in a web page and have it viewed in IE; only the first 32 are processed by the browser. The rest are ignored. So is the @import. Firefox and other browsers do not have such limits.

That's why I hate Internet Explorer. I love Firefox (hope this is not a spam).