Using portage-1.9.13 if I do: emerge unmerge mozilla-1.0_rc2 it says it no longer shows mozilla-1.0.rc2-1 in green as a package which will be excluded from the unmerge. The same thing happens with other packages I have tried. I am not sure whether it actually is going to unmerge all the packages or if the exclusion list display is just broken, but I imagine (hope) it is just the display
try emerge clean