This is more of a limitation of FrameMaker's implementation of the "OWL" interface. The Not Responding title bar and white screen appear not just with scripts and FDK clients, but also with other long FrameMaker operations, like updating large books, etc. In fact, in Kapil Verma's FrameMaker 11 webinar yesterday, the same thing happened when he was creating a book from a ditamap.
One way you can minimize the effect of this is to use a progress bar with your script, so people will know the progress of the script in spite of the white screen, etc.
Thanks Rick. Can you point me to some examples of how I might implement a progress bar?
I did. I implemented a progress bar. It also goes white during long processes.
Oh well. I guess I'll just do the best I can given this limitation.
Thanks for your help!