Can't upload picture Thread

Hi, Im new here.
I am trying to edit my profile and i am trying to set all of my pictures but it won't let me.
For example when i put in a picture for each one of the things; avatar, profile header image, and larger header profile image then click "save details" it brings me up to the top were i can upload the pictures and makes the first one ("avatar") dissapear, then if i try again it will make the next on diappear("profile header image") and so on.
And i tried uploading one at a time but it does not work.
Please help me.

Make sure it's the dimensions it recommends and the size it says
-Dan

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