For your ghosting problem, I'd say turn all of your sliders down... I forget which one really gives the ghosting on Photomatix cuz now i use Dynamic Photo, but try and lower the gamma, and take away anything about light radius or the like.
Goodluck. haha, this is why i switched away from Photomatix.
man - Dynamic Photo only samples at 72 dpi I think - from my raws and causes ridiculous noise for me...now if you know a work around for that, you've got me sold on Dynamic Photo HDR
I might be shooting in a iso setting that it doesn't like - i'll probably still play around with it - though with stuff not involving trees - Potomatix turns out alright for me
Goodluck. haha, this is why i switched away from Photomatix.