Marketpress error can't access manage orders tab. Using with Headway

I’m getting a strange error when trying to access the manage orders tab in the dashboard. This is a fresh install of wordpress but using the headway theme. I started with Jigoshop and deactivated it once I got this plugin. There are no pluggins installed besides marketpress and the branding pluggin. Here is the error:

This webpage is not available

The webpage at http://mysealsticks.com/wp-admin/edit.php?post_type=product&page=marketpress-orders might be temporarily down or it may have moved permanently to a new web address.

Error 330 (net::ERR_CONTENT_DECODING_FAILED): Unknown error.

Any reason for this?