First off thanks for this.
I've been having some issues. I tried registering account at tubepress.org but the forum login just redirects me to my account page and I can't get any further.
• The CSS in each theme overrides what I set for the thumbnail width and height.
• I tried to create a new theme by duplicating the default one (because I was having some CSS conflicts) and discovered that the default theme must be hardcoded somewhere, because it *always* tries to use the default theme, regardless of what I choose in settings, and whether I use the "theme=" parameter in the shortcode. The only option that seems to work is to modify the theme bundled with the plugin.