> > Hi everyone
> >
> > I manage a lot of PDF files and I'm accustomed to viewing them by
> > simply pressing 'O' for open in Ztree. Recently, I've found this
> > doesn't work any longer.
>
> Hi Alan,
>
> Have you recently started running ZTree as Administrator?
>
> If so, you need to change one of Acrobat's security settings.
>
> In Preferences, Security (Enhanced), uncheck "Enable Protected Mode at
> startup."
>
> - John

Hi John.

Yes, I have recently started running Ztree in Administrator mode, for various reasons. I did as you suggested and now everything is working fine. Many thanks for your help.

Alan