I do have another problem with the 3d glasses staying in sync.
I do sit about 2.3meters away from the 200cm screen, I have to look up slightly, the bottom of the projector screen (white part) is just below eye level, don't know if this is a problem.
below is an email i sent to benq, haven't had a reply yet.
I have a problem when using 3d on my Benq W1070 projector using Benq 3D glasses (rechargeable ones).
I cannot get the glasses to stay in sync, works fine for about 30-40 sec then the lens in the glasses start to flash with a red tint and then goes almost solarized through the glasses, the picture on the screen is fine and just shows the blurred 3d image. You suggested a shorter HDMI lead as the one I'm using is 9 meters, have swapped it out for a 3 meter one, I still have the problem. This is playing back 3d Blue ray, but any 3d content give the same problem.
If I hold the glasses front first into the projector light beam, they sync straight away but then lose it about 30 sec after I have sat down.
The glasses are fully charged.
The projector is mounted inverted on a wall behind me and is projected onto a pullup screen.
Does anyone have any ideas....