Problem Uploading New Images to version 3.7.1

Hi,

Would be so grateful if someone could help me today, I have searched various old posts on this problem but I cannot follow the solutions on the old posts because I have the new version of WordPress, and it seems a lot has moved or some options just aren’t there for me.

I have recently transferred my new website from my Subdomain to my main domain and I think this is where the problem lies, the transfer wasn’t so smooth and I had to log into myPHP and change quite a few links that were still referring to my sub domain. (not sure if this is the problem).

Problem
When I go to upload a new image It comes up blank and has a Blue question mark in the centre of the image, I have tried all sorts of different files and it still does the same thing. When I click on ‘edit image’ I can see the image fine for some reason but once put in a post or on a product the image cannot be viewed.

Please bare with me as I am new to this, Thanks