Pro-player playlist causing webmaster crawl error

Hi
I installed Pro-Player and created a playlist. It worked fine until I noticed Google webmaster was giving me crawl errors.

http://www.mysite.com/wp-content/plugins/proplayer/playlist-controller.php?pp_playlist_id=58pp-single-4d00e2deb87f2&sid=1291903711
http://www.mysite.com/wp-content/plugins/proplayer/playlist-controller.php?pp_playlist_id=10pp-single-4cfc79723fb99&sid=1291614578
etc
etc
about 20 of these showed up.
I do have robots.txt blocking /wp-content/.
After uninstalling the plugin, these errors continued. So I removed the plugin directory, uninstalled wordpress completely and reinstalled from scratch with a blank database.
These errors are still showing new entries in webmaster every week. Why is google still looking for this URL when the plugin has already been uninstalled? Has anyone else experienced this issue?