A bugs was found in the way vasp.184.108.40.206Jun15 analyses the symmetry of collinear magnetic structures.
A patch (patch.220.127.116.11082015) that fixes this problem can be downloaded from the download portal or our wiki.
Gunzip and apply this patch inside the vasp.5.4.1 root directory:
patch -p1 < patch.18.104.22.168082015
Sorry for the inconvenience,
The VASP team.