Keep in mind that you're exceeding the DVI spec for length by a factor of two (the spec only guarantees cable runs up to 5 meters) - although very low resistance cables can get you farther, anything extra in the signal path creates the potential for sparklies. Straight from HTPC to projector is as clean a path as you can get, but toss in an extra meter of cable from HTPC to 990 and the connectors and short conductors inside the 990's switching section and that may be enough to push you over the edge. It's an unfortunate limitation in the DVI standard (presumably due to DVI's original market of PC monitors, where you were not likely to go more than a meter or two). Outlaw may have some suggestions I don't know about, but you may have to look at a signal booster to use any sort of DVI switch with your projector.