[Plugin : Tweet This 1.8.3] Oauth errors?

Hi, im getting a strange problem with this plugin and wordpress 3.2.

I do have the latest version and get no php errors…

Problem is, tweeting is not working, i get a http 401 error (which looks like a oauth error).

I have triple checked all the details, they are fine, and even the oauth test button says they are right.

Cant work out this problem, altho i have noticed twitter have changed their app registering interface lately, could this be the problem?

Thanks
Gavin