Redirect loop when using domain mapping and custom page templates

Domain mapping plugin causes an infinite redirect loop when there is a custom page template in use. I have the latest version (3.0.5) of the plugin and the version 3.3.1 of WordPress.

Example situation:

I have site with a custom domain like http://subdomain.example.com and there is a page called "About" in this site. This "about" page uses custom page template named page-about.php. Permalinks are enabled with the option day and name.

When I type the direct url of the about page (http://subdomain.example.com/about/) to browser's addressbar, everything is working fine.

But, when I'm not logged in and I leave the trailing slash out (http://subdomain.example.com/about), it ends up to infinite redirect loop.

Anyone facing same kind of problems?