Your comments

With the latest sidewise version disturbing problems such as if I change a title and quit and immediately restart, the change is not recorded and some of the tabs that were present are gone. And if I choose export, nothing goes on the clipboard.  Unfortunately this could be complicated by the fact I am using OSX and use Chromium and not Chrome (but no problems before now).  Also the Sidewise update more or less coincides with a Chromium update and a OSX update and those updates could conceivably be the problem.  Please post a link or instructions so I can see if going back to the previous version solves the problem.  

Thanks (a contributor)