[mgoorevich]

I upgraded as well. After few days it feels fine and PT HD12.8.3 is rock solid.
Everything works fine including video out of AJA LHi with newer Aja's drivers.
There are still few annoying visual glitches with tracks sizes when moving clips across them.
Starting from PT 12.8.2 I have more frequent appearing of "Increase Buffer Size" message even on 1 track, no video most basic session.

Rewire works fine.
Though SoundMiner didn't support the font it has been set up for years, so I had to change it to another font from a preference's long list.
Exponential Audio, DMG, Fabfilter, The Cargo Cult (incl Conformalizer) and Avid plugs function normally.
Cedar is perfect too with my iLok auth.
My D-Command communicates with PT just fine.