I just got an Optoma 3D XL and the glasses will not stay in sync. The lenses will flicker and change colors and then sync, but the sync only lasts for 10seconds to a minute and then it starts flickering and goes back and forth between 2D & 3D.
Here is my setup.
PS3 and XBox 360 connected through a Yamaha 3D ready amp, to the 3D XL. And then to a BenQ MX 615 3D ready projector. All with HDMI of course. The projector is It is set up in a dark basement as well.
I am thinking it could be bad batteries in the glasses or possibly my 25 foot HDMI cable running to the projector, which I have not had any other problems with.