When I installed MarketPress just now I have encountered a very strange problem. It creates white space below the WP admin bar (in chrome and further down in FF).
I thought this was perhaps because I hadn't set it up or perhaps it was something to do with the floating cart. But no, I have switched this off and it's setup. The whitespace remains.
I was looking at the code in chrome and started deleting the CSS calls that MarketPress makes, as soon as I deleted:
<link rel="stylesheet" id="mp-base-css" target="_blank" href="http://www.rookery.scot/wp-content/plugins/marketpress/ui/css/marketpress.css?ver=18.104.22.168" type="text/css" media="all">
The white space disappeared. I thought this was very odd, so I opened up the CSS file. Did you know its got a load of base64 encoded code in there? Not sure what thtas about as I thought all your stuff was open source? Could it be the cause of the mystery whitespace?
Even if it is not I was pretty disappointed to see base64 code stuff in there!
So two questions really, why base64 encoding and the white space?