Post nw 6.5 sp5 problem

Since I applied SP5 to my NW 6.5 server, the server abends when I try and
access the server via a web page that uses PHP and MySQL. In looking at the
abend logs each halt entry points to a problem with LIBMYSQL.

I had been using MySQL v 5.0.18 and had the problem so I updated to 5.0.21
and the server still abends. Before I can proceed with further SP
applications, I need to resolve this issue.

Your advice is really needed.

Thanks.