rendering morphs as swf

First time user, patience please...
I have a simple morph. I render the timeline as swf. No matter how I open the resulting swf file, it's empty!
I open in in Flah 5 - empty. What am I missing?
I have a simple morph. I render the timeline as swf. No matter how I open the resulting swf file, it's empty!
I open in in Flah 5 - empty. What am I missing?