[Zope] Migrated from Zope 2.7.8 to 2.10; how to fix "Unauthorized: You are not allowed to access 'standard_html_header' in this context" error?

[Aleksey Tsalolikhin]

Thank you for your kind replies (Tres, Dieter), it was a matter of
security permissions on the 'standard_html_header'.

Thanks especially to Dieter, for the tip re enabling verbose security.

And TheJester helped me on #zope on IRC as well.   Thanks very much!

Best,
Aleksey