My brother and I both have AE-CC. He is working on a huge project and asked for my help, sent it via DropBox and when I open it I am getting this error:
"AfterEffects Warning: 4 files are missing since you last saved this project."
The file does open, but everything is messed up. Colors, scales of objects in compositions... its completely useless.
When he opens the same exact file he sends me it opens just fine, no error message and everything looks perfect.
If you're missing files, then that is likely the cause of your problem. Have your brother make sure that the missing files are given to you. You can find out what footage items in the project are based on missing files by typing
missing in the search field in the Project panel.