Looking at other posts I found out that I have to use the "alias" to place the file so my problem is solved.
You probably just need to remove the "as string".
Can you please show how you used the "alias" to place the graphic?
I am having exactly the same problem with a script I created and used to use all the time to place images.
I will really appreciate it!!
OK, I figured it out also.
In case anybody out there is having the same problem, this is the line of code I used:
set myGraphic to place (myArtFile as alias)
So I just changed "as string" to "as alias" and it worked.