Easy Blogging issue with the Wizard when the first step is /wp-admin/customize.php

I seem to get an infinite redirect loop in Easy Blogging with the new WordPress preview tool.

steps to reproduce:
1. In the Wizard, set /wp-admin/customize.php as the first step
2. In a test blog, turn on the Wizard - the first step is highlighted and the Preview tool opens (/wp-admin/customize.php). It does not open in the Easy Blogging iFrame.
3. Close the preview tool - it automatically loops and re-opens the preview tool.

Here's a screencast: http://www.screencast.com/t/iorigqCJaK6