Please stabilize sys-apps/portage-2.1.11.52. The most important fixes in this release are for bug 456340 (incorrect emerge handling of broken slot-operator deps) and bug 456342 (incorrect repoman handling of use.stable.mask for unstable packages with stable deps). Bug 456888 tracks all bugs fixed since 2.1.11.50.
amd64 stable
x86 stable
alpha stable
ppc stable
ppc64 stable
arm stable
hppa stable
ia64 stable
s390 stable
sh stable
sparc stable
Next stable request is bug 462134.