Re: PT 12 editing issues - cursor won't move, edit window jumps.
How about some up to date system specs? Your profile info is way old.
While waiting for that you're running El Crapitan which is the absolute worst OSX Apple has ever put out. You'd do better to move to something more up to date like Sierra/High Sierra (don't know if Mojave is qualified yet).
There's no preference to cure what you're seeing. You may well be seeing a system problem and NOT a PT issue.
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