Passwords suddenly not working

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PHP List,

I have a few scripts that have been around for a while. In one, is a simple login function:

$query = "SELECT * FROM forum_members WHERE memberName = '" . $username . "' AND passwd = MD5('" . $password . "')";
$result = mysql_query($query);

This was working fine, but recently I haven't been able to log in. I think the only thing that has changed is that on my hosting service, they recently upgraded to PHP 5.1.6. (MySQL is 4.1.21, but I think it's been that for quite a while)

Is there any potential for PHP 5.1.6 to handle things different when it comes to MySQL queries, post data, or anything? I thought it might be that I still had $HTTP_POST_VARS for some of my variables, but I changed them all to $_POST, and it still doesn't work.

I don't get any errors or anything. My own code is not very sophisticated for error reporting. But I'm not getting any PHP syntax errors of any kind. If I run the SQL code by itself at an SQL command prompt, I get results back, so I don't think the SQL is failing.

Are there any gotchas in the upgrade that I might be missing? I can't think of anything else that could be a culprit (though of course I'm open to suggestions).

Any advice would be much appreciated.

--
Dave M G
Ubuntu 6.06 LTS
Kernel 2.6.17.7
Pentium D Dual Core Processor
PHP 5, MySQL 5, Apache 2

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