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If it's moving relative to the drive side, it's most likely fucked internal spline in the crank itself, usually caused by the bolt having worked loose allowing the crank to move on the axle. Take it apart and inspect, although it's likely already too far gone to save.
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I had the same. Fucked splines as tester already said.
Take out the crank bolt and washer/coverthingy.
That way you can check if the splines engage correctly. I greased them a bit too to the unlock turboengage(tm) but someone will be along shortly to tell me you shouldn't.
I then just red loctited the crank bolt, yanked it to eleven and it held suprisingly well.
Check for play every once in a while, if play again, repeat, till you find a replacement crankarm. Hope for you it's the nds, replacements are easier too find. The road and track nds are the same.
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gbj_tester
Rodolfo
@boredom
I have a set of 7710 cranks and the nds one currently has a bit of play or slack (not sure exactly how to explain it) whenever I pull up on the downstroke or resist the pedals before it stops, and then when I go to pedal again it has to move the cm or few degrees worth of a pedal stroke before it is pushing against the chain again. Still useable since its on my track bike so I dont resist the pedals too much but still irritating.
Is this likely to be a fucked BB or crank threads? Both were used when I got them.