I just updated to the version 3.0.0-dev and it seems, that it works very well. - Thank you!
But I'm missing a feature in the general settings...
I think it would be perfect, when the Admin has the possibility to choose if the donation bar/statistics is shown to everyone or only to logged in users.
My donations are coming from the registered menbers of the forum, so these users are the only ones who concerns. - I think.

best regards
Michael