A bugs was found in the way vasp.126.96.36.199Jun15 analyses the symmetry of collinear magnetic structures.
A patch (patch.188.8.131.52082015) 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.184.108.40.206082015
Sorry for the inconvenience,
The VASP team.