Fatal error with Default Theme plugin

I have WP 3.2.1 with MU enabled and BP 1.5.

I installed this plugin and chose BP 1.5 as the default theme for all new sites. Then, I created a new site without problems, but when trying to view it, I got this

Fatal error: Call to a member function set_defaults() on a non-object in /mnt/webg/b3/30/52880430/htdocs/wp-content/plugins/google-analytics-for-wordpress/googleanalytics.php on line 1517

Others sites created before installing this plugin can be seen OK.
The error is the same whatever default theme you set.
After deactivating the plugin, the same site delivered the same error.

Is it because I have BP (this plugin is not labelled as BP-compatible)? Or some problem with the plugin 'Google Analytics for WordPress, that is running?

Cheers,
Jordi