This is not a flirtpack issue, but, rather, a mod conflict issue.
Did you install Virtue LAST - like, absolutely last, otherwise it won't work?
As well, did you install Flirt Packs after all other NPC mods(because I suspect that a NPC banter without a weight is at fault here, either from Beyond The Law or Fade)?
If the answers are no and no, uninstall Flirt Pack, exit, uninstall Virtue, exit, install Flirt Pack, install Virtue.
Also, all or most Ease Of Use components have been included into BG2 Tweak Pack(the latest version available at Gibberlings3), so I advise you to install this, instead.
Other mods
Official patch
If you installed *other mods* before the official patch, your game is really, really messed up. Read this thread for more information:
http://forums.pocketplane.net/index.php/topic,38.0.html