Since that I have uploaded my files and my DB to an actual server, NONE of the pictures of the website show up. I already checked the permissions and it should be fine. I ran a general report. There was one serious warning in CTools:
The CTools CSS cache directory, ctools/css could not be created due to a misconfigured files directory. Please ensure that the files directory is correctly configured and that the webserver has permission to create directories.
I am working on that one right now. Could that be the problem? Any ideas?