Beginner's problems

[axolrotflotl]

With the plugin installed, as well as the RMagick gem and ImageMagick, I still have problems getting it to work for me.

No thumbnails generated. ImageMagick runs; I have no way to verify that RMagick does the same -- but there is no thumbnail output whether I serve or build the site. I changed the gallerytag folder values in _config.yml to

    dir: media/images/
    url: /media/images/

but I'm not sure how that would mess things up. Please advise if I need to provide more information!

Only one column images displayed in the generated HTML page, despite having set a value of 4 in _config.yml. This is probably the simpler problem of the two, and just a matter of setting up CSS?

Edit: I set the thumbnail size to 200x200, but I know see that they are set to 150 square in the generated html. So I guess my _config settings are ignored altogether.