There's a cable of 0.7m between de Wii(2HDMI) and the HDMI switch. The label on the wrapping said "HDMI with Ethernet" and was recently purchased. I use a long cable to both connect both the HDMI switch and the Wii (directly) to the projector. This cable is 4m long and works great.
(The Wii works when I use this long cable to connect it directly to the projector. Four other devices (2 consoles and 2 PC's) connected via the HDMI switch also work using this cable, i.e. the long cable connects the HDMI switch to the projector.)
I'm looking into HDCP, Digital Content Protection. Isn't it weird that the Wii does work when connected directly, but doesn't via the HDMI switch, since four other devices do function via this switch? Could this problem really be caused by HDCP?