Illegal String Offset errors in MarketPress

Hi Folks,

I am setting up a localhost test with XAMPP and multisite to figure out how to use MarketPress for a common shopping cart shared among sites.

However when I go to the shopping cart on one of the sites I get these errors:

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Warning: Illegal string offset 'address1' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2160

Warning: Illegal string offset 'address2' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2161

Warning: Illegal string offset 'city' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2162

Warning: Illegal string offset 'state' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2163

Warning: Illegal string offset 'zip' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2164

Warning: Illegal string offset 'country' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2165

Warning: Illegal string offset 'address1' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2160

Warning: Illegal string offset 'address2' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2161

Warning: Illegal string offset 'city' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2162

Warning: Illegal string offset 'state' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2163

Warning: Illegal string offset 'zip' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2164

Warning: Illegal string offset 'country' in C:\xampp\htdocs\omega\wp-content\plugins\marketpress\marketpress.php on line 2165

===================

It looks like the fields that make up the Marketpress checkout form are causing the problem.

Does anyone have an idea on how to resolve this?

Thanks!