Hi Victor, thanks a lot for this helpful hints... I thought, my hosting-provider installed php 5.2.x on the server, but it's only 5.1.x (a little problem, cause I got a dating community based on Dolphin 6.1.4 installed with thousands of members)... :-/
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I tried the installation on a different server with php 5.2.x and it works without use of the revision.

Now I can start testing... :-)