Director Player error

I get the following error when going to several web sites:
Director Player Error

This application (Safari) requires and Xtra (PopupMenu) that either does not exist or failed to initialize properly. Please make sure the appropriate Xtras are in the Xtras folder(s).

I do not have the pop up windows blocked.

Any idea about what I need to do to get rid of this error message? I have the latest version of all software (OS and Safari 2.0.4).