Got some other fix for the different problems (the one with the File Sharing not working on the Hackintoth and the one with not connecting to another file share):

The Rev.2-install has some problems with file paths of some symbol links.

1. open the Terminal
2. 'sudo -s' for becoming root
3. look at /System/Library/Filesystems for the symbol link afpfs.fs. It has to point to '/System/Library/Filesystems/AppleShare/afpfs.kext', mine was showing to 'System/Library/Filesystems/AppleShare/afpfs.kext' (notice the missing slash at the beginning)
4. if it's wrong (without the slash): 'rm afpfs.fs' and then a 'ln -s /System/Library/Filesystems/AppleShare/afpfs.kext afpfs.fs'
5. for fixing the problem of not being able to share something: look in /usr/sbin for AppleFileServer, also a symlink, which on my computer was also missing the slash at the beginning