Hello, I recently purchased a 3d Acer H6510BD, it works amazingly with my 3d bluray player streaming from my HTPC and with my gaming PC with a beefy graphics card. Playing SBS MKV's or any other content works flawlessly. I'm primarily working with SBS MKV's though have tried some others as well. However, when I connect up my HTPC which is an older computer with a Radeon HD 5450 graphics card or my new macair, when I run the exact same software to play the exact same video files with the same settings, it works, but really hurts my eyes as the images are too far apart. When I take the glasses off I can clearly see that with these two computers the overlay of the images is significantly further apart than with the blurray player or the gaming pc. I've tested it with Kmplayer, a new version of cyberlink DVD, and VLC. All have the same results. I've only tested VLC on the mac, but same results. Can anyone tell me what I am doing wrong or offer any insight? Thanks.