I helped a friend with his 3-way switches today. He has two 3-way dimmers that used to work to dim one light. He removed the one light and added six recessed lights, but all should work the same. Unfortunately now neither of the dimmers work, and each light switch only functions if the other is in the opposite position (e.g., switch1 only functions if switch2 is down, and switch2 only works if switch1 is up). I followed the following diagram at:
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it is wired accordingly. The only difference is that it is an old house and there are no ground wires. The switches also aren't labeled with "common", but it seems obvious that the odd-colored screw is the common...and besides, it worked before and the only wiring we redid was at the light (where the power enters as well). Any clues?