Nope, I'm only using one component input. As I stated originally switching to the other component inputs did not help at all. The same flashes continued to occur at the same time regardless of which input (DVD, Video 2, Video 3) was used.

As well the component inputs were the only video inputs to cause problems. If possible try connecting through the Video 4 inputs on the front panel (unless you really want to dig around in back) with either S-video or composite or both. Does the problem persist?

Personally I only checked composite since my only S-video cable is in-use and would be a PITA to swap around. I deemed that proving that composite did not demonstrate the problem (and my experience of never noticing any issues with devices hooked up via S-video or composite) was sufficient.