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I don't see the problem either, in Firefox 3.6.12 on the Mac.
The first one looks funny, but the second looks fine (firefox on Windows 7)
I see incorrect spacing in both of them. I'm using Firefox 3.6.12 on a Mac. (FWIW, it took me a while to see the incorrect spacing; both examples are fairly unobtrusive.)
Oh. Unobtrusice, eh? We need to start posting screen shots, then. Here is what I see (Firefox 3.6.12 on Mac, MathML rendering):
The spacing does not seem all that strange to me.
I get this bug all the time; I think I remember reporting it on math.SE and being told that (in my case) it was some problem with the dev version of Chrome. Here's what I see in Chrome 7.0.544.0 on Windows 7:
It's extremely annoying, but it only happens about half the time for me.
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