Inserting new tasks - DELETE key and BACKARROW do not work

When inserting new tasks - in the title box on the Task entry page I am unable to use the DELETE key and the BACKARROW key to correct any typos. 

Hi Dominic,
can I ask which version of eM Client are you running (Help > About section) and if your Internet Explorer is up to date?

Regards,
Olivia

6.0.23421

The problem appears to have gone away now. Also I am on Windows 10 and Edge is up to date.

Regards
D