I think I may have it!! I haven't been able to test yet, due to some home issues, but an Apple Forum led me in the right direction. Under preferences>audio, there's a setting called "Recording Delay". I checked it many times, NOT knowing that the slider has to be IN THE MIDDLE, at 0. Not far left, like I thought it should be. I'll let you know the result, but another user had the same issue. Neither one of us know how the slider got to that position. I shall, however, blame myself. Thinking maybe early on at setup, I slid the slider (slid the slider?) Hmmm. ok. Salacambella!

Oh...and also read somewhere that this is one of Apple's biggest support issues/questions. There may be a software update with this fix inclusion coming next.

Oh wow, I was sure I'd mentioned that setting, but I see that I didn't [or I accidentally edited it out]! That's there to compensate for exactly this kind of situation, and yes, you're correct, the middle position is the default/neutral position -- it can provide either positive or negative timing compensation. Most of the time there's no need for it -- I haven't seen anyone mention having to use it for years -- but maybe there is some kind of older bug that's resurfaced..? Let's hope that restoring it to the neutral setting does solve the problem :-) rather than it turning out to be an Apple/Logic bug..

Yes. I was wondering why it was there in the first place. Still have't been able to test it...being a homeowner and all. Somethings always broken... I will keep you posted.