OMG, what a co-incidence, i was just now doing a search on how to create an error log so i could report the exact same error.   Both the greeter and the walk-by 'jump' apart at the end of the greeting, but the walk-by still shows as greetable.
   The only hacks i upgrated since last playing the game were:  I also don't have PETS nor GL.

ltwvariety -(first time installing)
no20Khandouts - (first time installing)
antiwatchout - (upgraded)
dailygarderner - (reinstalling to try again, wasn't happy the first time)
dramafix - (upgraded)
relevantwages - (upgraded)
BRU - (upgraded)
BUY - (upgraded)
Moneyorder - (first time installing)
CustomerSelector - (first time installing)
  I've had cases in the past, where i've greeted walk-bys and after the greeting, they keep walking and leave (but they HAVE officially been greeted).  This is a residential lot, no home business.

  I've only had one teen do a date since installing those updates, no problem tho.  I have in the past found that the teen needs to be fairly close to the vehicle, for the whole 'drive off' to occur.

(modified to include my first ever error report)

   My apoligies Ness, i didn't mean to infer the action drops off.  Just from my experience, unless the teen is close to the vehicle, i'll get the 'where to' dialogue, and the 'taxi/car' dialogue, but the 'who is going' and the 'where to go' dialogues don't show up unless i manually direct the teen to get in the car to drive to a community lot.  If the teen is in the right placy, all the dialogues show up correctly.  I never knew if that was a bug or just part of the game.

Dramafix was updated here, too.  I also had the lot reset thing going on.

I do have GLS, though - but it doesn't appear to make a lot of difference.

Dramafix is now removed, but I won't be able to actually get in and check things in game for about the next 12 hours or so.

Thanks for tracking down our pesky litle hack, John!