I know there are a lot of "blank page" topics but none have helped me so far.
I just totally deleted everything from 2.3.1 and uploaded 2.3.3. Everything shows up just fine until I update or create a new PAGE. Posts are fine.
If I edit or create a new page, it comes up completely blank. I have updated my permalink stucture as well.
I did the proper upgrade etcetc.
In the default template everything works fine as well... I had the same theme on 2.3.1 with no problems.