[lkb] Generator chart has edges for bare affixes

Hi,

One of my students has created a grammar with an interesting
pathological property: when one uses it to generate, the chart
contains edges for affixes corresponding to many of the lexical
rules (as if they had attached to a null stem).  Any idea
what might be causing this?


The grammar can be found here, if anyone wants to play with
it:

http://courses.washington.edu/ling567/arabic.tgz

A test case is:

 ?-i?dar  ?-akal    ?al-kizaz-a
 1SG-can  1SG-eat   the-glass-ACC
 'I can eat glass'

Emily