Hi Gerald
Being aware of plugin conflicts I have run the sites with all plugins deactivated – no problems – with only URL shortener activated – Visual editor not avaialble – all plugins apart from URL Shortener activated – editor works OK. Every time I reactivated your plugin I have issues.
I am running four sites with three different themes, Arras, Eximus and Intrepidity because I thought it could be a theme conflict but even though two of those are from the same author (possible duplicate coding)the third one isn’t.