New release causes -410

Hi, I recently got version 5.0.5 Informix for my SCO system. I recompiled all my 'C' code now I'm getting a database error -410. The PREPARE statement is okay e.g. $prepare xxx for "update tab1 set tab_name = ? where tab_key = ?"; The DECLARE statement worked e.g. $declare xxx_cur for xxx; The EXECUTE statement gave me the -410 e.g. $execute cursor xxx_cur using :tab_name, :tab_key; I'm doing this all from memory so I may not have it exact. This code worked on 5.0.1 and now (5.0.5) it doesn't. Does anyone have a clue????