Your comments

Thanks for the information - in the guide it talked about splitting the command between URI and Data, I will put the whole string into URI tomorrow when I get in the office and report back

Thank you for this! If it is useful, I can send you my project file in case it's a particular issue relating to my project.

I have also had this error pop up now when dragging across from the gallery. Restarting the app seems to help, or changing the view from list to thumbnail and back (sometimes)

I agree - same thing for me - use for scheduling and timers would be fantastic. I am one of the 90% who does not have a Javascript background, so GUI tools etc are a must for me.