It seems that upstream modified VirtualBox-4.1.6.tar.bz2 and as a result its checksum and size differ from what is declared in the manifest file. Reproducible: Always
Oh dear... why can't they just increase the version number?
+*virtualbox-4.1.6-r1 (06 Nov 2011) + + 06 Nov 2011; Lars Wendler <polynomial-c@gentoo.org> -virtualbox-4.1.6.ebuild, + +virtualbox-4.1.6-r1.ebuild: + Revision bump because upstream re-released tarballs (bug #389773). + All other affected virtualbox packages were updated as well. Thanks for reporting.