Post preview fails when turning on GoToWP

After installing GoToWP Premium we noticed that we are no longer able to Preview a New post that has not been published.

The behavior we observe with the plugin installed:

• Add a new post (not a page)
• give it a title
• click save draft
• click Preview
• The resulting tab pops open to a page http:/yoursite.com/?p=7557&preview=true
• The page which shows in this tab is the home page

Without the plugin displayed the post is displayed in the tab
This only happens to new posts which have not been saved and does not occur with new pages.

We verified by turning off each plugin one at a time and only this plugin has this effect.