What could be the problem? After a restart of vdr everything seems to be normal, but then suddently that behaviour kicks in without further notice. All the rest on that machine is running normally, I also have xorg-x11 + kde 3.3.1 installed, and actually I am watching the live-signal on my monitor using kvdr.
Perhaps it is the default EPG scanner timeout in VDR. EPGScanTimeout = 0