0.4.6 is out, renaming 0.4.5 ebuild from portage to 0.4.6 worked fine for me.
Please use 0.4.6b which has just been released, it fixes a severe bug in 0.4.6
rename it to liferea-0.4.6b.ebuild, because of the new version.
thanks for your reports, i've bumped the version in portage now.
thank you liquidx.