Table Does Not Exist

I have a program which works fine on my system.  It is accessing
an Oracle database (using TCP/IP).  At the client's site I can
log into Oracle fine.  I query one table and get the result
without a hitch.  When I try to open another query I get the error
"Table does not exist".  It does!  The query is very similar to the
one that works.  Just a different table.  I can use Oracle's Sql*Plus
to query the table all day long.

Here is the sql strings in the query control:

from "HIGH_PAG"
where "KEY" = 1

It works fine on my desktop, which also connects to Oracle.  I've tried it
with and without the quotes around the table name.  Any ideas would be greatly