Can't See the Image

[Ray]

I've had this problem come up before and here it is again today. I've 
never posted it before.  It seems kind of intermittent.

It's simple.  A script sets the FileName of an image in Livcode to the 
full path of a png disk file but the image in Livecode simply doesn't 
show it.  The image object on the card is blank.  If I open the 
properties palette, select the path in the "Source" field, cut it and 
then paste it right back, the image suddenly shows up.

Is there some sort of a refresh or "Preload in memory" setting I should 
be checking here?