Problem with paragraph tags

This plug-in does pretty much exactly what I need. My only problem is with the paragraph tags on the shortcode.

If I put the shortcode on the same line as my content, the first paragraph of my content has no paragraph tags around it and is followed by an empty <p></p> line. However, if I put a line-break between the shortcode and my content, it creates an empty <p></p> line before my first paragraph. Either way it makes for wonky spacing on the page. Is there any way of preventing this?

http://wordpress.org/extend/plugins/columnizer/