Please check if all modules were updated to the latest versions, after system files update. You can do it from Studio > Apps Market > Updates
Wow. That solved the problem. I had to install all modules inside > Updates. It's working now. However, html tags are showing when you post or publish your text.
I also noticed that in the album all images are not showing.
And when you click an image filename ... page not found.
However, when you go to album's homepage, it's there showing.