Lynn, did you try uninstalling and reinstalling?
Betas are known to be glitchy- hence "beta" *wry smile*
I don't have a Mac, so I don't have experience with iPhoto. However, I have been an ACDsee use for many years.
I did use Bridge and Picasa on my PC and neither of them every really worked well for me.
Have you checked out the ACDSee Forums for Mac Beta? There is a lot of good info on all of the ACDsee forums, but this one would be most helpful to all of you.
ACDSee Pro for Mac Beta