I have narrowed problem my problem down to 1 record in 1 table. It is
not a particularily important record, so I just want to delete it.

delete
from tableA
where ID=450;

causes a "internal gds software consistency check (cannot find record
fragment (248))" error after which you need to close isql.

You can not select this record or backup the database either, the
same error.

Any ideas?

Adam