I just installed the plugin but somehow nothing shows for my picasa album.
It didn't break my plain old gallery, but nothing is displayed when I enter a valid gallery tag for Picasa.
FWIW, this is the tag I entered (generated with the wizard):
[gallery type='picasa' user_id='juanabsatz' kind='album' album='JuanAbsatz' max_results='100' thumbsize='75']
I let that in a post if you want to check it at http://www.juanabsatz.com/540/gallery-test/
As you can see, something does get inserted:
<div class=photonic-picasa-stream id=photonic-picasa-stream-1>
Album has no restrictions that I know of, you should see it at http://picasaweb.google.com/juanabsatz/JuanAbsatz