The sscs are in a state of flux right now. The v1, v2, and v3mod all have minor issues. The v3 mod was pulled until RJ has taken a little break...
The v1 does better by replacing the 330 ohm resistor with 150 or 180 ohm resistor (I had very little trouble with this config)
The v2 worked better for some, but I think the 47 ohm resistor (same position as the resistor above) causes as much trouble as the 330 ohm resistor on the original v1. There are other hardware differences, so the v1 and v2 are not firmware compatible.
The v3 mod works for both v1 and v2, but it was pulled for now.
Standby for the v4 mod and firmware. Very similar to the v3 mod, but will use a different pin on the pic to drive the output.