Can’t upload images on new theme

That is a common Mac OSX issue – you need to adjust your file permission for the uploads folder. The problem with changing the permissions manually is your have to change them each time you create a new project, which is tiring.

You can give MAMP permission and you will never have to worry about the same problem again. Here are some instructions: http://ifmeister.com/mamp-file-permissions-for-a-local-development-environment/

Good luck.