Hi Robert,
actually no, I didn't change from px to em. I added the em. Previously it was just using the "size" value, but Chrome does not respect the Size attribute on number fields.
Now that actual em amount is what you want to check. It should be the same as size/2+1 . In the first implementation of this a build or so back I set the em = size, but that was way too big. So I've reduced it by half. If you check in firebug and it's half, then yes, that's likely the actual size going forward. (On my machine it's about the same going forward).
If however it's the same as the size then there's something wrong either in the build, or the install of the build.
cheers
Bruce