Folder action not working outside automator

Question

I have a folder action to convert and move all mkv files from within the downloads folder. The folder action included (among other) the following script:
on run {input, parameters}
          set filename to POSIX path of input
          do shell script "/usr/local/bin/mkvdts2ac3.sh -n " & quoted form of filename user name "white" password "*****)" with administrator privileges
  #do shell script "mount -t smbfs //panos:z2kdft50@nas/internal internal" user name "white" password "******)" with administrator privileges
          do shell script "mv " & quoted form of filename & " /Users/white/internal/library/" user name "white" password "****)" with administrator privileges
          do shell script "rm -rf /Users/white/Downloads/*.dts" user name "white" password "*****)" with administrator privileges
          set message to "File " & filename
          return message
end run
The total workflow runs perfectly from within automator.
The problem is that when the folder action is triggered from the system (regular usage, ouside automator) the workflow executes up to the point that the applescript is implemented (I ghave installed growl notifications at various points to know how far the script has run)
Does anybody have any idea why could this be happening?
I  have looked around but found no answers.
Thanks.
<Edited by Host>

Answer 1

Thanks.
I replaced the applescript with the following shell script:
/usr/local/bin/mkvdts2ac3.sh -n $@
mv $@ /Users/white/internal/library/
rm -rf /Users/white/Downloads/$@
It works.
I had tried a shell script in the very begining, but I could not get it to work so I resorted to Applescript instead. I felt myself too that applescript was an unnecessary complicated procedure just to run shell commands.
Anyway, now, each time a dts download finishes, it gets transcoded to dolby digital so that it can be played on my samsung tv (it's media player does not support dts).