I've changed the server and now the ScrobblerSig doesn't work anymore.
Here is the link of the php-file: http://www.synesthesia.de/scrobbler/scrobbler.php
It should display this picture: http://www.synesthesia.de/scrobbler/scrobbler_600x100_07.png
And that's the current configuration of the php-file: http://www.synesthesia.de/scrobbler/scrobbler.txt
Are there any requirements for the ScrobblerSig?
Here are some information about the installed php: