secondo me ti converrebbe gestire la cosa in modo diverso...cioè mettere fuori dall'enterframe il preload

Codice PHP:
gal.attachMovie("mc""mc"+(i+1), i+1);
                                                       
gal["mc"+(i+1)].thumb.loadMovie("images/"+thumb);
                                                       
gal["mc"+(i+1)].attachMovie("mc_ThuPreload","mc_ThuPreload",0);
                                                       
gal["mc"+(i+1)].mc_ThuPreload._x 92;
//inserire qua il preload delle thumb...magari usando moviecliploader e quindi loadClip al 
//posto del loadMovie