same problem here. always at one certain clip. i've deleted, reimported it. no change. i'm guessing it's just a bad clip, though it plays fine in finder and in the PP browser viewer...until it's put into the sequence.
thanks for helping out a bonehead!
FCS3 / Adobe CC
3.33 GHz 6-Core Intel Xeon Mac Pro
ATI Radeon HD 5870
...and a few TeraBytes o' storage
(then it's on to PetaBytes, ExaBytes and MosquitoBytes!)