[Zope-CMF] Weird ZPT Error when customizing

[Chris Withers]

Hi All,

When customizing FS PageTemplates through the web, I get the following weird error when I
try and save any changes to the new PageTemplate using ZMI:

Compilation failed
TAL.TALDefs.METALError: fill-slot must be within a use-macro, at line 56, column 1

...despite the fact that the fill-slot in question works identically in the FS
PageTemplate.

What on earth is going on here?

If I turn off macro expansion and delete all the expanded macros, the template
mysteriously starts working again.

Huh?!-ly yours,

Chris