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@el_squire
Me either, it left the bloke at BLB perplexed as well, he took the bike for a spin and it happened to him too, couldn't work it out, so we took the back wheel off checked the lockring in case skidding had loosened it and it had shifted slightly. So lockring got tightened 1 1/8 chain slapped on it and it was sweet as a nut, left us both flummoxed as the drivechain of a fixed gear bike doesn't require a degree in engineering.
Only thing we could deduce was that it was a combination of the sprocket and chainring being 1 1/8, the lock ring was slightly loose and that the 3/32 chain was stretched.
Who knows, was massively annoying but it's since been solved and no problems at all!