Version 1.7.1: Twitter stopped working

Hi,
we use the social media plugin and it worked fine at first. After updating WP to 4.7.4 we needed to reauthorize FB again but Twitter was working fine then, too. Now after updating the plugin to 1.7.1 feeding Twitter stopped working. Not sure what to do now, we didn’t change any settings.
Our log says:
statuses/update_with_media : {“errors”:[{“code”:32,”message”:”Could not authenticate you.”}]}
Don’t know if I need to set it up again or not.

Any help would be appreciated, thanks in advance!
Frank