I have used certain plugs in the signal flow before mixdown--I assume if the resultant mixdown is out-of-sync--then these are latency causing plugs. Any way to work around? If you add any plugins to the busses and outputs and set the compensation to "all" you will experience latency even if you don't have any plugins on the channel you're working on. Don´t use plugins (unless you absolutely have to, like ie a guitaramp simulator) during recording. Then after you have recorded the track then add whatever plugins you want on the channelstrip (but remember to set compensation to "audio objects and instruments"). When you have finished recording and are getting ready to mix then change the compensation setting to "all" and everything you insert (including the busses) will be compensated for and therefore kept in time but you will experience "live" latency if you play an instrument. It's a shame that Logic compensates the busses by delaying all the rest instead of moving the bus with latency back with a negative delay but that's the way it is. Luckily this is fairly easy to work around as long as you are aware of it.