Rtmpsrv dependencies?

[dude]

Hi. First off, I am not a guru so please bear with me. I have been enjoying rtmpdump a lot for the past few years. I use it mostly with rtmpexplorer. Anyway, here my weird situation. I have two machines. Both on Win7 64 bit. I have an exact copy of a folder containing rtmpexplorer and rtmpdump on both machines. On the one machine, rtmpsrv willl extract the rtmp link from certain streams so I can open it with VLC. On the other machine it does not work for the exact same stream that works on the first machine! I.e. rtmpsrv would simply not "see" anything. It is also worth mentioning that the "non-working" machine does work for certain links. So it is not the case that one machine works and the other does not work at all. I can also open the extracted rtmp link from the working machine on the non-working one. Somehow rtmpsrv does not behave the same on the two machines.

Any ideas why this is the case? Are there system-wide files, which "work with" rtmpsrv to extract the rtmp link of the stream?

I would be grateful for any pointers in the right direction.