[Zope] Guestbook example app stops working

[Bernard Devlin]

Hi, I'm looking at the idea of using Zope again (a lot seems to have
changed..)  I'm using Zope 2.11.1, and whilst trying to remind myself of the
basic machinery of Zope, I  imported the Example apps, and started to fiddle
around with the Guestbook example.   However, after saving the index_html
object of the Guestbook, Zope would no longer find any entries to display.
To check it was simply the act of saving index_html that broke the
Guestbook, I deleted the Examples folder and re-imported it.  With a fresh
Examples folder Guestbook worked; simply saving it (without even typing in
the textarea) would break the Guestbook.  On initial import it shows a
single Guestbook entry by "Amos", but after saving index_html, it reports
that the Guestbook is empty.  No changes were made to the 'getEntries'
script, and the Entries folder still has the entry by "Amos".

I can't see any reason why that would be, and hoped someone else could
explain what the problem is.
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