I read somewhere (probably E-Town, DigitalTheater, or AVSForum) awhile back that the problem is something in the design of the RCA box. Supposedly part of the reason that RCA is the only one with a box available is that they didn't wait for the industry specs to be set in stone. They made a couple of engineering decisions and designed their decoder and TVs to match up. However, the final specs were slightly different and so their boxes will only work perfectly with their TVs.