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Through pure folly, I discovered an offline-bounced wav file was not totally matching the original audio - it is a few milliseconds late. This forced me to check other recent bounces (stems for a track), to discover they have done the same thing! 
I restarted the computer after a PRAM reset and tried re-bouncing tracks as a test, with adding sound at the start that I know for sure starts on the 1 (cowbell from the LPX 808 Boutique drum machine). Adding the new wav files to a new Project revealed that the cowbell was slightly off - it didn't start on the 1 in the wav file!!! 
Has anyone else encountered this in LPX? How did you fix it?
I restarted the computer after a PRAM reset and tried re-bouncing tracks as a test, with adding sound at the start that I know for sure starts on the 1 (cowbell from the LPX 808 Boutique drum machine). Adding the new wav files to a new Project revealed that the cowbell was slightly off - it didn't start on the 1 in the wav file!!! Has anyone else encountered this in LPX? How did you fix it?