[Zope] all dtml rendering as source after 2.4 upgrade (heelp)

[Simon Michael]

This is bizarre.. upgraded from 2.3.x to 2.4.2. Zope seems to be
running fine except that all DTML is shown in source mode - my own
methods, the ZMI etc. Purged and reinstalled a clean zope 2.4, fired
it up again with my old data.fs, same thing.

Anyone got any ideas why this could happen or how to fix ? Short of
downgrade, export, upgrade, import ?

Thanks in advance,
-Simon