Same thing here. It appears the patch only prevents the bugs it fixes from happening. If your game got bugged before the patch you are screwed unless you go back to a save that was just before you finished taking the castle.
Bethesda should specify if the bug fixes are retroactive, i noticed about the glitch just when i do the take the independence mission. I see in the patch notes about the fix and i continue playing, expecting that i would be able to speak with Preston in a near future. but now i see there is no solution, and i don't go to start a new game with +100 hours played.
Thanks for letting us know. Hey JackTres, I just sent you a PM so we can help investigate.
I expected to know if finally we can find a solution or pray in the Diamond City Chapel for Preston second coming