quvi has released a new version. Just bumping the verison in the ebuild name works for me. Altough there will probably be another release soon since youtube broke yesterday in the current version of quvi, so you might want to keep an eye out for that.
There is a fix for the youtube bug mentioned above here: http://sourceforge.net/apps/trac/quvi/ticket/5
hmm I didn't see that bug, bumped anyway