BuddyPress.org

Doing more research I found the following thread in the wp-forum:

https://wordpress.org/support/topic/273413?replies=2:

—-

Mippe: P2 brokes äÄ öÖ åÅ letters when editing. That pretty much sums it all up.

noel (Administrator): We’re aware of the issue and will fixing this in the next release.

But I am still unsure: This problem then occurs only with WordPress MU?