VSX-44 conflicts with TV tuner and Viewsonic pjd7820hd projector
I have a VSX-44 connected to a Viewsonic PJD7820HD projector, and this setup works fine with all my sources except the two HDMI tuners I've tried, an iView 3500STBII and a ViewTV At-263.
The tuners connected directly to the projector via HDMI work fine.
The tuners connected to the VSX-44 show "searching signal" on the projector, while the blue HDMI led on the VSX-44 is lit.
What steps should I take to resolve this situation, or figure out where the problem is?