Okay, I found the culprit. It's neither a package or some settings.
I use Dropbox to synchronize my user folder, so I have access to my custom settings, snippets etc. on all my machines. To achieve this I have my user-folder in my dropbox and use a link on this folder to give Sublime Text access.
Guess I'll have to live with that since I really have no idea how I could possible work around that.
Nethertheless thank you for your reply.