I would just like to say that, firstly, the issue was indeed resolved by the info KevinC provided.
I can only apologise for not returning to confirm the fix. It's by no means an excuse, but due to the intermittent nature of the issue, that would happen randomly and in no fixed time period. By the time I noticed that the issue was resolved, I had forgotten it existed in the first place. Unfortunately I didn't receive any notifications that replies had been posted, else I would have dropped on to confirm a LOT earlier.
Once again, many thanks for the assistance, and I will most definitely return to confirm fixes in the future.
A red faced wolf