After purging qmltube and the libqtm-12 installs, as well as removing libqtm-11 (just in case-installed by other progs), rebooting and reinstalling qmltube, I still get the error reported in http://talk.maemo.org/showpost.php?p=1020253&postcount=943
Mplayer & mediaplayer do just fine. Am on CSSU and power kernel47.