Kail, i have had some problems (without VE) when Tab Mix Plus and Sessionsaver was installed at the same time. The problems was gone when i uninstalled Sessionsaver. TabMix has sessionsaving too, so they might go in to some conflict... I have not tried VE though, but it can be worth trying, to uninstall Sessionsaver...
AOwL, thanks for your suggestion. I don't think TMP & SS conflict at the moment on my system. But, when I try VE again (maybe later this week) I'll remove SS & see if makes any difference.