We suddenly find that we are unable to close the Excel application until each
individual workbook is closed. Unfortunately this includes the hidden
Personal.xls. That means we have to un-hide personal.xls, then close it, in
order to exit from Excel.

It's possible this is related to something with our integrated apps, but the
only changes we made this week were the installation of a number of security
patches. Wondering if anyone else has encountered a similar problem and/or
may have found a solution for this.