I have run some further tests as a result of t l s's post earlier and the fact that he usually used the "Stop On-Access Protection" prior to third party on-demand scans without problem, yet he too experienced the same hang if he just paused standard shield.
If I also use the "Stop On-Access Protection" before running third party on-demand scans no problem after the scan click the "Start On-Access Protection" and avast, standard shield is up a running and no hang. The same is true if I terminate Standard Shield, run the on-demand scan and then Start Standard Shield, no hang.
So what is the issue with pausing Standard Shield that causes this hang when Continue is pressed ?
What are the functional differences that might cause this ?