Forum Text can't be entered in the default search field

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I've run a couple of test configurations using StyleVars and each time after a bit of work on the fonts, navbar and header, text at this point forward cannot be entered into the search field. I've tested some of the padding issues but that doesn't seem to help. I have no idea what might be causing this as changes to the search elements and/or restoring them to their original values does not correct the situation. Of course the install right out of the box worked fine so apparently some change I'm making (using VB4's Skinning the Forum handout) is causing this. Anyone else experienced this problem? Solutions? __DEFINE_LIKE_SHARE__