Hi Rob,
Thanks so much for your offer of help, however the host for this site is very clear that he does not want anyone else to be given admin privileges.
Today I deactivated/reactivated only a few plug-ins as I need to keep most of them. No change with the issue. The issue may be specific to the theme – I don’t know. Looks like we will have to go with the client logging in as me.
Again, thanks so much for your speedy responses. Happy Holidays!