iPreview() and opensister() allways end in crash

Hi!

I've developed a system with WD17 where different modules can be opened simultaneously, however each time I open the preview of a report from one of the modules and leave it open while I use another one the app ceases to work at all, I must close it with the task administrator, this is something my users complain a lot about.

Is there something I can do to avoid this?

Thanks