This is a rather crazy bug I've discovered. Using After Effects in latest MacOS Catalina on my iMac Pro. When stopping timeline playback with the spacebar, there is a huge lag for the playhead to move to the end of the preview time. After much fiddling around, I managed to deduce the cause of this, and it has something to do with the audio. If I am using the iMac Pro headphone jack with headphones, the lag is present. However, if I unplug the headphones and plug them back in, the lag disappears. I've recorded a screencap to show the behaviour first with headphones plugged in, and then after I've unplugged and immediately plugged them back in: Obviously, I can't keep unplugging/plugging my headphones back in each time I need to start on a new project, so any insight into this is much appreciated. Interestingly enough, the same behavior occurs with my USB audio interface set to the output, too. If I unplug the USB cable and plug it back in, the delay goes away for that as well. The only thing that works without going through these steps is the built-in iMac Pro speakers...no lag ever when using them for output.
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