Download videos from fundorado DOT de (partial success achieved)

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Hello dear experts :-)

I've bought an account for fundorado DOT de and just found out (after spending quite some money) that I can't easily download the clips there.

The good:
I've been able to download few videos by using rtmpdump.

This download worked for me:

rtmpdump -r "rtmp://streaming.fundorado.com:80/pp_fd4/?vses=aa2d53a876bb40f103722cb5b7c51920a3c04fb0&vhash=6ba05c67c62bc9f8402de79a2898c2b87866b5e8" -a "pp_fd4/?vses=aa2d53a876bb40f103722cb5b7c51920a3c04fb0&vhash=6ba05c67c62bc9f8402de79a2898c2b87866b5e8" -y "mp4:/club/exklusiv/internet_aufriss/145_156/149/hi/01_hi.mp4" -W "http://www.fundorado.de/src/swfplayer6/jwplayer_flash.swf" -p "http://www.fundorado.de/club/exklusiv/" -z -o "ia149.flv" -v

This download didn't work:

rtmpdump -r "rtmp://streaming.fundorado.com:80/pp_fd3/?vses=622363eed61ab69bdd0a417807adbec6ce15ef1b&vhash=a01703205b031b7359dbeb42ed3d0a3041f706b4" -a "pp_fd3/?vses=622363eed61ab69bdd0a417807adbec6ce15ef1b&vhash=a01703205b031b7359dbeb42ed3d0a3041f706b4" -y "mp4:/club/exklusiv/internet_aufriss/085_096/091/hi/01_mid.mp4" -W "http://www.fundorado.de/src/swfplayer6/jwplayer_flash.swf" -p "http://www.fundorado.de/club/exklusiv/" -V -o "ia148.flv" -v

Things I could figure out so far:
1. If the --app contains "pp_fd4", all downloads work. If the --app differs ("pp_fd", "pp_fd2", "pp_fd3"), the downloads actually start, but it stops pretty soon with this output:
[...]
DEBUG: HandleCtrl, Stream BufferReady 1
84.345 kB / 0.36 sec (0.0%)
DEBUG: Socket closed by server, nBytes: 0
DEBUG: Invoking deleteStream
ERROR: RTMP_ReadPacket, failed to read RTMP packet body. len: 11039
137.766 kB / 0.58 sec (0.0%)
DEBUG: RTMP_Read returned: 0
Download may be incomplete (downloaded about 0.00%), try resuming
DEBUG: Closing connection.

Any idea what could be wrong?

I've attached my rtmpdump -V logs. If it would help: I can provide output of rtmpdump -z as well.

Thanks in advance :-)