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Well, it is GNU/Linux, yes. It is not on a local server, but on one by the hosting provider which, if I am not wrong, runs RedHat.
Permissions are usually automatically left right and unmodified as I upload stuff directly from the tarball to the server using krusader file manager/ftp client. I also checked now and permissions seem to be fine. I somehow don't think it is an issue with that.
I'll give it a more thorough check though, just to be sure, but I think it might be something else.
Thanks for the suggestion though (and cheers for Arch, a great distro! ;)
Daniel