On 1/30/2014 9:24 PM, dpb wrote:
On 1/30/2014 5:25 PM, wrote:
....
When I took off the connections on the one fixture, it was white on
white, black on black, and ground on ground. I would have noticed if
it was mixed. and I didn't even touch the other light. I just don't
understand how it could have worked and then all of sudden stop
"Stuff happens..." 
If as outlined previously you can't understand how the wiring is
_supposed_ to be based on readily-available wiring diagrams for 3-way
switches to use to diagnose the problem, sounds like time to call in the
pro...
--
It could be that there was damage to the wiring and the jostling of the
wiring created a short. If I follow this thread, correctly, you only
replaced the light fixture and after this is when you noticed the short.
Is it possible that it shorted before? Meaning that you are positive
that the breaker was not tripped before you made the replacement? If
so, then the problem is at the location of the first fixture that you
replaced. Either the fixture is wired improperly or there is an issue,
physically, with the wiring. Inspect the wiring, then isolate. Put
wire nuts on each individual wire and stuff back into the box. Turn
breaker back on and flip the switch on-off. Wire nut fixture without
mounting back to outlet box, turn breaker back on and flip the switch
on-off. You might get it to replicate, but if you do manage to get it
working without tripping the breaker this does not mean that everything
is okay.
You must find out why it is tripping and repair the problem. Hopefully
you just mixed up a traveler with the neutral.