TwitterConnect library returning 401 Unauthorized error returning for a fraction of users

apps.twitter.com
oauth
api

#1

Hi. I have an asp.net app that is using the ASPSnippets.TwitterAPI.TwitterConnect library to connect to a twitter app. It can successfully fetch user profiles for many users using the FetchProfile() method. There are 2 users however who are returning an oath error of status=401&error=The remote server returned an error: (401) Unauthorized.
These users have authorized the twitter app to have access to their profile. I have so far been unable to figure out why these couple of users are having an issue, while many other users are having no issue at all. Looking thru their profile settings has thus far not shed light into what the issue is.

Any assistance in helping resolve this is appreciated. Thanks