Wordpress permissions

I have a couple of wordpress sites I added to my server via FTP. One works fine and allows for plugin update and file uploads, the other I can't update plugins or upload images. I checked the folder permissions and they all look fine as well as the group for those folders and files.

Could the problem be due to the fact that I did the ftp under my user account and not the main account for that domain?

Is there anything else I can check?

Thanks in advance for the help/input

Bob