The ALTER TABLE and DROP COLUMN did not work for me (similar issue to yours encountered last week) as I have indexes in the table. Therefore I backed up my...
If it is likely that it is an MDAC problem, have you tried running the "Component Checker" available from the Microsoft web site - this has sorted me out on...
Each solution cures my problem (accracy required as tax is being calculated on some large figures and liability arises if a error arises). I've used Hanno's solution as...