Automatically open in Preview script wont work on 10.6

Question

Trying to take pictures with an Eye-Fi card and have them automatically open full size in Preview upon uploading. The script I have works just fine for my iMac running 10.5, but not at all on my iMac running 10.6. The script works fine if I physically drag a file into the designated folder, but not it uploaded. Same thing when I make folder action scripts in Automator. Please help. Here is the script:
on adding folder items to this_folder after receiving these_items
-- PROCESS EACH OF THE ITEMS ADDED TO THE ATTACHED FOLDER
repeat with i from 1 to number of items in these_items
set this_item to item i of these_items
tell application "Preview"
activate
open this_item
end tell
end repeat
end adding folder items to

Answer 1

Does it change anything if you write the script as follows?
*on adding folder items to this_folder after receiving these_items*
*   tell application "Preview"*
      activate
*      repeat with this_item in these_items*
*         open this_item*
*      end repeat*
*   end tell*
*end adding folder items to*