Version 6.61.3 is running like a charm

When I install 6.63.2 there is no picture and no sound. If I try to change the channel ProgDVB hangs. A reinstall of 6.61.3 and it works again.
Any Ideas?
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OS Windows XP Home Sp3
{BDA} Hauppauge WinTV 88x DVB-S/S2 Tuner/Demod
Demultiplexor: Elecard
Video Renderer VMR-9
MPEG-2 Elecard