I won't say that is impossible, but the chances two different files are mixed during download are like one in a million, because LimeWire and other gnutella clients are calculating a checksum (a sha-1 hash) for every file they have. LimeWire will only swarm from files with exactly the same sha-1 hash.

Anyway, I do not believe your problem has anything to do with swarming. I suspect the apparently corrupted files are really perfectly okay, they are just not downloaded completely, so your player will jump alot when playing those incomplete files.

Swarming cannot be shut off (except you modify the source code) and the older versions, that do not have swarming are versions like 1.8 or 1.9 and they cannot connect to Gnutella anymore.

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