Consumer Keys/Access Tokens randomly stopped working



I’m using TweetSharp as a way of accessing profile information and tweets for a specific account based on the consumer keys. The consumer keys and access tokens were working last week. I’ve tried to access the service again today and found that the keys and tokens have stopped being authenticated. I’ve tried regenerating these but still no joy.

Has anything changed recently in the way keys/tokens are authenticated which TweetSharp may not have picked up on yet?