"Soooooo, if you had the PS3 switched thru the receiver also (if you had another input) you would not have the occasional problem?"
Actually I do have the switching issues with PS3 connected into my Pioneer,thats why I switched it up and put it directly into switch. I think the sync issue with that is the Pio is sending a differnt resolution signal to switch at start up of PS3 and projector (720p 60hz) cant handshake to it through switch. Removing Pio from equation and my PS3 syncs up with projector and tv flawlessly (except on very few occasions and a reboot of switch fixes that.)
"I have Directv, Blu Ray and a Roku XDS box running straight into the Monoprice"
How do you connect these 3 to Pio for audio ?
"but when i switch inputs, the projector or tv sometimes have problem syncing with the source."
That's why I have only 1 source (The pioneer for the 3 sources) into switch. When using PS3 I time delay on Harmony one so that the switch goes on first to Imput 2 (PS3) then PS3 turns on and syncs up well to both tv and projector. Your harmony 520 can do it,I used to have long ago.
Hope that helps