can't relink from MS access after dropping field

After dropping a field in a postgres table this morning
(alter table tstudents drop company_id)
I now get an error message from Access when I try to link to that
table:

.........pg.dropped.31........
is not a valid name etc.

In the get external data>link tables>ODBC databases() dialog box the
name of the table looks normal: public_tstudents

using ocbc driver 7.2.5.0

I am hoping that after vacuum runs tonight the problem will go away; in
the meantime I will use a backup copy of my access app which has the
original link intact and still works.

Any ideas?

Thanks

Fred Parkinson
Association of Bay Area Governments 

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TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match