I would comment out line 90 of the post type switcher plugin
add_filter( 'wp_insert_attachment_data', array( $this, 'override_type' ), 10, 2 );
I don’t see any reason why anyone would want to change the post type of attachments.
Honestly, the plugin has not been updated in over a year, not even to update the tested up to value, and from the looks of the support forum it is not getting any. I wouldn’t use this plugin at all. If you really need this then I’d deactivate this plugin and only activate it when needed. How often do post types need to be switched?
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