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Update:

I overlooked the “Please also make sure you are not using the MU trunk, but the 2.7 branch.” — I was using the WPMU trunk. So I “downgraded” to the 2.7 branch.

Now I have “Activate XYZ plugin sitewide”-Options in the Plugin area. I still have a single BP-Plugin though. I activated the BP Plugin sitewide. And it seems to worl fine.

But I ran into following problem:

I needed to update “/wp-includes/capabilities.php” to the one of the trunk-Version. The one of the 2.7-branch gave me this error on all pages:

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in

/www/wpmu/wp-includes/capabilities.php on line 537



Warning: array_merge() [function.array-merge]: Argument #1 is not an array in

/www/wpmu/wp-includes/capabilities.php on line 537



Warning: array_merge() [function.array-merge]: Argument #1 is not an array in

/www/wpmu/wp-includes/capabilities.php on line 539