Which version was the project upgraded from? You may have to run a utility on DHTML effects if the project originated on an old version of RH.
Jeff alluded to something to try. In RoboHelp, try clicking the Tools menu and choose the option titled: Update DHTML Effects in Topics... and see if that changes anything for you.
Thanks Rick - I just couldn't remember the name of it off the top of my head ;>)
That did it! Thank you both so much.