Having the same problem... If you go here http://api.twitter.com/1/avinashkaushik/lists/memberships.xml you will see the cursor is 0. This guy is followed by ton of lists in fact...
Below is the snapshot of the result I got...This is screwing up our app right now... ....... <profile_background_image_url> http://a1.twimg.com/profile_background_images/79104366/twitter_background.jpg </profile_background_image_url> <profile_background_tile>false</profile_background_tile> <notifications>false</notifications> <geo_enabled>false</geo_enabled> <verified>false</verified> <following>false</following> <statuses_count>3208</statuses_count> <lang>en</lang> <contributors_enabled>false</contributors_enabled> </user> </list> </lists> <next_cursor>0</next_cursor> <previous_cursor>0</previous_cursor> </lists_list> -- To unsubscribe, reply using "remove me" as the subject.