I was having major sync problems with my Ultra-Clear DLP glasses but have just discovered a DIY solution. I'm using them with an Acer projector and the glasses just would not sync, at all! 
I tried every combination of settings on the projector, checked the batteries, turned every light in the room off, checked the batteries again, still no luck... Meanwhile my Optoma ZD101 glasses were working perfectly. I was thinking of returning them when by chance I discovered that if I stood completely outside of the room, with the door open just a few inches so I could still see the screen, the glasses synced! Great, but this was not an acceptable solution... 
There was obviously too much reflected light bouncing around the room, (which is quiet small with gloss paint walls), and this was overwhelming the photo-sensor in the glasses. Most DLP link glasses have some kind of filter or crude lense to over the sensor to prevent this happening, but the Ultra-Clears just have a clear plastic window, in certain conditions this will cause problems.
I experimented with several improvised "filters" and one of them cured the sync problem instantly - a piece of computer component anti-static bag!!! If you haven't seen one before its made of a kind of silver coloured semi-transparent plasic "foil", I'm sure there is some kind of professional photographic filter with the same properties but I couldn't tell you what it's called. I cut a small section and taped it over the sensor to test, now my Ultra-Clear glasses sync perfectly, and stay synced, even in broad day-light.
Looking at the glasses it should be possible to remove the platic window and place the filter inside, but I haven't been brave enough to try this yet. The manufacturer could fix this problem very easily but I suppose there must be trade-offs in terms of sensitivity / range that they have considered. If anyone else is having sync problems with the Ultra-Clears, or any other DLP glasses, give this a shot and let me know if it works for you...
I tried every combination of settings on the projector, checked the batteries, turned every light in the room off, checked the batteries again, still no luck... Meanwhile my Optoma ZD101 glasses were working perfectly. I was thinking of returning them when by chance I discovered that if I stood completely outside of the room, with the door open just a few inches so I could still see the screen, the glasses synced! Great, but this was not an acceptable solution... There was obviously too much reflected light bouncing around the room, (which is quiet small with gloss paint walls), and this was overwhelming the photo-sensor in the glasses. Most DLP link glasses have some kind of filter or crude lense to over the sensor to prevent this happening, but the Ultra-Clears just have a clear plastic window, in certain conditions this will cause problems.
I experimented with several improvised "filters" and one of them cured the sync problem instantly - a piece of computer component anti-static bag!!! If you haven't seen one before its made of a kind of silver coloured semi-transparent plasic "foil", I'm sure there is some kind of professional photographic filter with the same properties but I couldn't tell you what it's called. I cut a small section and taped it over the sensor to test, now my Ultra-Clear glasses sync perfectly, and stay synced, even in broad day-light.
Looking at the glasses it should be possible to remove the platic window and place the filter inside, but I haven't been brave enough to try this yet. The manufacturer could fix this problem very easily but I suppose there must be trade-offs in terms of sensitivity / range that they have considered. If anyone else is having sync problems with the Ultra-Clears, or any other DLP glasses, give this a shot and let me know if it works for you...
