I have booted in Safe Mode and as your post suggested was unable to use some of 
the applications to replicate the situation I was in when the freeze up 
occurred. I will keep an eye on things though and am in the process of running 
DiskWarrior on the disk to make sure everything is normal.

Thanks again.

Matt.  
> 
>> On 11 Nov. 2016, at 2:49 pm, Matt Falvey <[email protected] 
>> <mailto:[email protected]>> wrote:
>> 
>> Hi Peter, No I haven?t started it up in Safe Mode. What should I do start it 
>> in safe mode and keep it in that mode for how long to see if the problem 
>> occurs in safe mode? Should I operate the same apps as I was using before 
>> when the iMac froze or is it sufficient just to start up in Safe Mode and 
>> then close down and go back to normal?
>> 
> 
> The idea is to start in Safe Mode, then try to do the same things which you 
> notice cause the problem. This is not always completely possible, of course, 
> because Safe Mode prevents the loading of some software components which 
> might to necessary for things to work properly, but if your computer 
> suddlenly starts to behave properly then it?s an indication that the problem 
> comes from something that is loaded during the normal startup process. It?s 
> just a starting point, really, but I have actually seen problems disappear 
> simply by booting into Safe Mode, then restarting normally.
> 
> Peter Hinchliffe        Apwin Computer Services
> FileMaker Pro Solutions Developer
> Perth, Western Australia
> Phone (618) 9332 6482    Mob 0403 046 948
> --------------------------------------------------------------------
> Mac because I prefer it -- Windows because I have to.
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