QuickTime movies not consistently playing in front and fullscreen during loop

The following script looks through all the movies in a directory. After looking around it seems that this script incorporates best practices but when I run it the first movie/document plays in the front (present) and fullscreen, but when it switches to the next movie it is behind and not in full screen. When it loops back to the first it is back to full screen.

the extra "activates" were added based on something I read to possibly help with the issue

Ideas?

tell application "Finder" to set movieFiles to (every file of movieFolder whose name extension is "mp4") as alias list

tell application "QuickTime Player"

repeat -- forever

repeat with aFile in movieFiles

--display dialog " movie name " & aFile

set activeMovie to open file aFile

tell activeMovie

set looping to true

set scale to 1

activate

play

set presenting to true

set foo to (duration)

delay foo

close

end tell

activate

end -- loop movieFiles

end -- forever

end tell -- QuickTime

[Re-Titled by Moderator]

Original Title: Sequoia + AppleScript +QuickTime: make all movies play in FRONT and FULLSCREEN in loop of movies