Last emerge --sync was at 8th of March, 16:00 (UTC). These are the packages that would be merged, in order: Calculating dependencies | * Digest verification failed: * /usr/portage/kde-base/libkworkspace/libkworkspace-4.2.1.ebuild * Reason: Filesize does not match recorded size * Got: 662 * Expected: 638 ... done! emerge: there are no ebuilds to satisfy ">=kde-base/libkworkspace-4.2.1:4.2[-kdeprefix]". (dependency required by "kde-base/plasma-workspace-4.2.1" [ebuild]) (dependency required by "media-sound/amarok-2.0.1.1" [installed]) (dependency required by "@world" [argument])
Well, the tree is sane. Please re-sync your portage-tree and in case the error still isn't gone, reopen this bug.