Solved

Change profile picture

I want to change my profile picture but I select the new photo and I keep it and nothing happens, the change does not become effective.
I have tried other devices and the same thing happens.
What can you do about it?

Have you tried refreshing or closing & re-opening your browser? This is usually all you have to do to see changes

yes and continue the same photo

nothing help me?

I'm sure a moderator or someone else who has had the same problem will help you with this issue soon.

Is this a problem in the app or on PC?

I tried it from the computer and from the mobile (android 4.4.2) and I can not change it

Okay, I'll document it as an issue and let the developers know about it.