Screen Flashing in LC 6..6.3

[Roger Guay]

I’m using OS X Yosemite and LC 6.6.3 and noticing an occasional screen flash when unlocking screen with visual effect. Can anyone confirm? Here is a sample of my code that sometimes causes a screen flash. Makes no difference what visual effect I use . . . near as I can tell.

on mouseUp
   lock screen for visual effect
   set the vis of image "galex" to not the vis of  image "galex"
   unlock screen with dissolve
end mouseUp


Thanks,

Roger