MarketPress Products stuck in loop

I originally posted the question here: but support stopped responding to I'm reposting.

When clicking to view a product in marketpress it sends the site into an infinite loop.

With debug on I get With debug on, I can see the product page but these are the errors, any ideas?

Strict Standards: Redefining already defined constructor for class Login_Redirect in /homepages/16/d140852201/htdocs/wordpress/wp-content/plugins/login-redirect/login-redirect.php on line 45

Deprecated: Assigning the return value of new by reference is deprecated in /homepages/16/d140852201/htdocs/wordpress/wp-content/plugins/login-redirect/login-redirect.php on line 146

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /homepages/16/d140852201/htdocs/wordpress/wp-content/plugins/login-redirect/login-redirect.php:45) in /homepages/16/d140852201/htdocs/wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/external/wpmu-lib/functions-wpmulib.php on line 73

Notice: add_custom_background is deprecated since version 3.4! Use add_theme_support( 'custom-background', $args ) instead. in /homepages/16/d140852201/htdocs/wordpress/wp-includes/functions.php on line 3201

Warning: Cannot modify header information - headers already sent by (output started at /homepages/16/d140852201/htdocs/wordpress/wp-content/plugins/login-redirect/login-redirect.php:45) in /homepages/16/d140852201/htdocs/wordpress/wp-includes/pluggable.php on line 1173

Notice: Trying to get property of non-object in /homepages/16/d140852201/htdocs/wordpress/wp-content/plugins/marketpress/marketpress.php on line 1674

I have deactivated Login redirect based on the errors above, but still have the problem. Any insight or help would be appreciated. I believe the problem is with the last error of "property of non-object".