Just a little follow up note,

I searched the Details of my PayPal transactions on their site and I am not finding any references to "unique", "parent" or for that matter "web_accept".(?)

It does state Payment Type as "instant", with my tests.

I plan to move on to 1.3.6 anyway, I think I'm ready to cram a bunch of mods on so I can find more interesting ways to find problems that don't exist.