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| p.1 #3 · Red tint in jpeg files after LR3 conversion. |
What app are you viewing your newly minted jpegs in? Your problem has the hallmark of viewing images in a non color managed application written all over it, and that exporting to your monitor profile supposedly "fixes" the issue only confirms that. This is a classic symptom of basically mismatched color spaces and particularly when using a wide(er) gamut monitor and a non color managed viewing app or browser.
Let's say that your display is close to Adobe RGB in gamut, but your app can't use the embedded profile in your image. It's going to display that sRGB or the ProPhoto RGB as if is were actually Monitor RGB, which is why the ones your export in your monitor profile look right - because they are right, but only for your monitor.
View them all in a properly color managed app or browser and all version will look the same, or very very nearly the same.
sRGB is still the lowest common denominator and is the preferred choice for internet graphics, but even more important is to use fully color managed apps, now that there are a large mix of monitor gamuts being used out there.