Strange Black Window with New Web Pages

When I open a new web page in Safari I get a black DevonThink window calling for a comment. What is this and how do I stop it?

Hi,

In Safari’s preferences, on the Extensions pane, select Clip to DEVONthink and disable it. I’m not sure why this is happening at present, but we have a plan that will definitely resolve it in future, and in the meantime this will prevent the bug from interfering with your browsing.