I did not check "inner sidebars", guess I should have, but since I had no inner sidebars originally, it didn't occur to me that they might have migrated.
No posts had disappeared, but sidebars were a mess. Attempts to rebuild them didn't stick, a bug Ive noticed on current version. Just seems a little quirky sometimes, no biggy.
I don't remember having to re-install header images on previous upgrade, maybe I did, I dont recall. Anyway, Since tweeking the new install would have taken a little while to rebuild, and it was during a busy traffic time and I didnt want the site to be messy for an hour or so, I just went back to 3.3.
After skimming the threads posted after the new upgrade was made avail, I dont seem to be the only one, so I'll stick with 3.3 till it seems things have calmed down, or I have more time during off hours to mess around with it. Thanks