Odd warngs with MySQL and PHP5.1.2

I've just moved to 5.1.2 from 5.0.5 and I'm getting these warnings for
each and every query:

PHP Notice: Object of class DB_result could not be converted to int in
/opt/csw/php5/lib/php/DB/mysql.php on line 980
PHP Notice: Object of class DB_result could not be converted to int in
/opt/csw/php5/lib/php/DB/mysql.php on line 983

Every thing aappears to be working, just scores of these warnings.

Any clues?

-- 
Ian Collins.