Ok, will do thanks a lot. The AppleScript is/should be on the Main Thread. I am 
assuming that the App the Script has finished when it returns but maybe that is 
not the case. I will look into that too.

Thanks a lot for your help. 

Cheers
Dave


> On 22 Sep 2016, at 16:42, Jens Alfke <j...@mooseyard.com> wrote:
> 
> 
>> On Sep 22, 2016, at 5:20 AM, Dave <d...@looktowindward.com 
>> <mailto:d...@looktowindward.com>> wrote:
>> 
>> So I’m wondering if it is something to do with the AppleScript handling?
> 
> AFAIK, AppleScripts can only be run on the main thread. But it’s been many OS 
> releases since I worked with them.  Even if it’s legal to run them from a 
> background thread now, they might be doing something like dispatching the 
> actual execution to the main thread? (I’m just speculating.)
> 
> Anyway, if the main thread is unresponsive, then drop into the debugger and 
> look at its stack to see what it’s blocked in. Experiment.
> 
> —Jens
> 

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