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That's puzzling. Don't know if it will help, but for reference I'm running the dev channel build on OS X.
I'm running 4.0.249.78 (36714) on Win 7 64-bit right now (where I get a slightly different problem than I described), but my description is from the latest build on 32-bit Win 7. Hey I realize most of you guys like the single omni-box, (I consider it a waste of real estate), but at least make the second FireFox/IE type search box optional. Let the user decide.
I have no problems making it optional, as long as many similar options don't add bloat over time. But to fix your problem you might want to run either the beta channel or dev channel builds.
Dev channel: http://www.google.com/chrome/eula.html?extra=devchannel Beta channel: http://www.google.com/chrome/eula.html?extra=betachannel