[Zope] Filesystem Page Template lowercase-ifying all my tags

[Floyd May]

I have a product that installs some filesystem page templates into a plone
site's portal_skins. The templates are exactly the same as their
created-through-ZMI counterparts, yet the filesystem templates render with
all their tags lower-cased, whereas the ZMI-created templates preserve case.
Why is this happening?

Zope 2.7.7-final, python 2.3.5, freebsd5
Page Templates 1.4.0

Thanks!
fm
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