The Plugin Oven is now the official home of Column-Matic—the latest plugin by Twinpictures.
Some of you may be finding stray p or br tags that is causing wonky spaces. This is occuring because of the default order in which WordPress processes the content—wpautop (the WordPress core function that converts line breaks to p or br tags) is run before the shortcodes are processed. We are working on the an official fix to include in our plugins that does not effect formatting of all installed plugins.
In the mean time, feel free to check out the Column-Matic documentation for a couple of work-around solutions.