I've just downloaded your plugin and was giving it a try. After creating a custom post type - namely shop - and also a new shop based on that custom type, I faced a problem when I tried to display a shop.
WordPress said there was an error at reed-write.php (line 517), and I saw your line 516 said:
$_rw_plugin_dir = WP_PLUGIN_DIR.'\reed-write\field_types\\';
And those backslashes were causing the error, so once I've changed the line to:
$_rw_plugin_dir = WP_PLUGIN_DIR.'/reed-write/field_types//';
Everything seems to be ok so far.