If your Intel Mac is a new acquisition then that may be the problem. We were using Slick effects and when we switched over to an Intel Mac they seemed to disappear. I contacted Slick and they have a new set of plug-ins that are universal. Ray Rogoway rogoway at infionline.net On Nov 6, 2007, at 11:32 AM, Donald Tully wrote: > Hi Listers - I have been using iMovie HD 6.0.3 quite successfully > for a long time. Suddenly, in the middle of building a slide > program, I am unable to add transitions. I am getting a quite > useless error message that states "An unknown error has occurred" > each time I try to add a transition - either an original Apple or > aftermarket type. I tried creating a new project with different > photos and had the same problem. I also tried rebuilding the iMovie > preference file several times but that didn't resolve the issue. > > Any suggestions? BTW, I am running an Intel Mac 10.4.10. Thanks > for your help... > _______________________________________________ > MacDV mailing list > MacDV at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/macdv