[Zope-CMF] filesystem python script errors?

[alan runyan]

first time i loaded a page I got:

TALESError: exceptions.RuntimeError on
/home/zope/ZopeProducts/CMFPlone/skins/plone_scripts/navigationLocalRelated.
py has errors. in "standard:'here/navigationLocalRelated'", at line 17,
column 5

second time I refresh the page I got:
TALESError: exceptions.NameError on global name 'context' is not defined in
"standard:'here/navigationLocalRelated'", at line 17, column 5

if I 'refresh' my product.  all works again.
CMF1.3b1, Zope2.5.1, Python2.1.3, Plone CVS

~runyaga