In a Wordpress 2.7.1 install running a K2 Theme (1.0-RC7) if both the OpenID plugin (http://wordpress.org/extend/plugins/o...) and the WPTouch Plugin are active, the site loads fine from a computer, but gives a fatal error from the iPhone. The problem is resolved if either plugin is deactivated. The fatal error is as follows (pardon any typos, I don't know how to screen capture on the iPhone):
Fatal error: Call to undefined function is_active_widget() in [path]/wp-content/plugins/openid/comments.php on line 382.
I already opened a ticket at bravenewcode.com (http://support.bravenewcode.com/topic..., but wanted you to know, because my solution so far has been to deactivate the WPTouch plugin (which I really want to use).
I've replied on the Brave New Code forums, since I'm fairly certain the problem is with wptouch.
Just for future reference, support questions for the wp-openid plugin should be directed to the WordPress Support Forums, as mentioned in the Plugin FAQ. Had Chris not pinged me about this, I never would have seen it. I do however monitor the WP forums.