I ‘m using the ios app for managing blog sites. I introduce one of the plugins that automatically switch the request to m.mydomain.com if it’s coming from a mobile device. This then breaks the ios app, I suspect because it is no longer receiving what it expects.
As we bloggers cannot install plugins here at WordPress.com I assume that site is not being hosted by WordPress.com and you are posting to the wrong support forum. We cannot help you here. Support for your website software and any advice you need are provided on the WordPress.org support forums and they are here http://wordpress.org/support/