After an upgrade to JCE 2.5.7 our dear old friends the <p></p> started to appear before and after the <hr> upon saving.
Please please please make them go away for ever and ever!!
Please please please make them go away for ever and ever!!
It seems that module parameters haven't been configured properly. Please make sure that you are using a valid twitter username, and
that you have inserted the correct keys. Detailed instructions are written in the module settings page.