Emerge tries to downgrade imagemagick to 5.5.6, then emerge -u --deep world tries to upgrade it again. This happens because the perlmagick ebuild contains: =media-gfx/imagemagick-${PV} Throwing a * on the end in the perlmagick ebuild would seem to fix the problem for -rX releases of imagemagick, without having to also bump the -rX release of perlmagick.
This problem is getting really annoying. Please fix it.
fixed now, sorry for the delay