script no longer working. to mount external NAS

Hello,

I've had a script running on mav, since i can remember.
it's runs automatically via startup, loads the script - runs it, and mounts the external NAS, connects to it, and then the script automatically closes the script editor in the dock, wu lu - simples.

installed yosemite public preview,
script says upon startup -
failed to connect to external NAS please make sure destination address is correct / something along those lines.

so uninstalled yosemite -
restarted ...
script ran perfectly ... connects and mount and closes fluidly.

reinstalled yosemite, haha, same error again...

process of elimination means yosemite no longer likes this script

what do I do ?
do scripts not work yosemite anymore ? the destination of the NAS hasn't changed, it's still in the same place, not changed nothing apart from the upgrade from mav to yosemite

any suggestions ?