No scenery was changed for some days now and yesterdays test .. regen was 30 seconds (on my screen).
Something is still wrong.
There's nothing wrong. Several days ago you couldn't have used the newest version so, as soon as you installed the update, it's NORMAL the cache would have been regenerated again entirely, because there was none in the new separate P3D folder which has been added after the update.
Do you still have the same long regeneration time if you launch P3D AGAIN, WITHOUT changing anything in the Scenery Library ?
I thought with the new separate caches what I do in FSX should not affect P3D .. correct?
Yes, and you can have proof of that, if you change something in FSX, the P3D cache won't be regenerated.
I do not know how to read the log for problems .. I only look at the very bottom of the log for time to regen an general data there.
The log doesn't show any problems. I have the same regeneration times in FSX and P3D, and they are all measured in seconds.