Appreciate the encouragement
Mine was running for years - literally. Had to add functionality and ended up with this problem w/ Paypal - did not change that procedure at all.....
Had to "change the location" of my certificate, but that took a few minutes and was working fine.
When Paypal tries to post the IPN, I get NADA in the log. No https activity at all.
So, my though was perhaps its an issue with encryption.
Does anyone know, if (d)encryption fails is anything posted to the log on screen?