You can get a 4x2 HDMI switch which has a built in audio out splitter and not use the receiver to do the HDMI switching ONLY when you need 3D mode, that way you can still use the receiver to do the switching when in NON-3D viewing. You could also just entirely use ONLY the new HDMI switch for the switching instead of the AVR, that is if you only have (1) HDMI cable run to the PJ instead of (2) runs available.
Something like that, although it might be easier to buy a new receiver which is known to be 3D compatible to the Epson 5010, especially if you don't have 2 HDMI cable runs back to the PJ. You could also return your Bluray player and find one that has DUAL HDMI outputs, and then do two HDMI runs from the Bluray (one direct to PJ, one to AVR).
If trying the new switch idea, I would plug the Bluray player into any of the switches inputs, and then have one HDMI out from the switch going directly to the projector, and the other HDMI out going to the receiver which then goes to the projector (if you have two HDMI runs to the PJ available). You will also need to run the audio out from the switch to the receiver so when in bypass'd 3D mode you can still get audio. Adding an HDMI switch in front of your receiver could cause issues though, never tried it personally, but it might not. Doesn't really hurt to try since you can return it or as noted just use the switch from now on and the receiver only for audio.
This is why when people pay to have HDMI cables ran to a projector, always get 2 cable runs done instead of one, plus it serves as a backup if the cable end breaks or something goes wrong. They will often try to charge you double for the second run, but you just tell them you want it parallel at the same time for less money (try to negotiate).Edited by coderguy - 8/18/12 at 10:18pm