You've got a pretty difficult setup to get working due to the way HDCP works. When you split an HDCP encrypted source the 4:2 splitter must decrypt then re-encrypt the audio/video for each down-stream device independently. Depending on how the 4:2 device operates, it may send back upstream the keys and capabilities of the downstreams devices to the source device. Your sound processor does not have a downstream device connected to it so it might not be sending back proper HDCP information.
Therefore, depending on the source device it may respond differently, such as the Sony source doesn't care about HDCP until it starts to play a movie and it gets a non-compliant HDCP code from the sound processor and you get pure video noise. The cable box may be ignoring the HDCP information from the sound processor and sees the info from the Qualia and is happy.
One oddball thing you could try is to connect an HDCP compliant display (maybe you have a computer monitor that has an HDMI or DVI[HDCP] input) to the video thru on the audio processor and see if that clears up your issues. It may give you some sort idea to fix the problem without having to place a real "dummy" display to the sound processor.
NOTE: the reason the video on the output of your sound processor is magenta colored is most likely caused by one of the data pairs not connecting or working on the HDMI link. If you lose one of the data pairs (there are 3 data 1 clock) the screen will appear tinted green or red depending on which pair you lose. If you lose the other data pair you won't get any image because the D0 data pair contains the video sync information. If you lose the clock pair you won't get any connection either.
Therefore, depending on the source device it may respond differently, such as the Sony source doesn't care about HDCP until it starts to play a movie and it gets a non-compliant HDCP code from the sound processor and you get pure video noise. The cable box may be ignoring the HDCP information from the sound processor and sees the info from the Qualia and is happy.
One oddball thing you could try is to connect an HDCP compliant display (maybe you have a computer monitor that has an HDMI or DVI[HDCP] input) to the video thru on the audio processor and see if that clears up your issues. It may give you some sort idea to fix the problem without having to place a real "dummy" display to the sound processor.
NOTE: the reason the video on the output of your sound processor is magenta colored is most likely caused by one of the data pairs not connecting or working on the HDMI link. If you lose one of the data pairs (there are 3 data 1 clock) the screen will appear tinted green or red depending on which pair you lose. If you lose the other data pair you won't get any image because the D0 data pair contains the video sync information. If you lose the clock pair you won't get any connection either.