I got the same errors on my forum move and the fix I had to do was simple. I dropeed all the tables in the mysql and then went into myphp and laoded the back up I made. worked like a charm... I also had to change some of the info in the config.php to the new server route.
this stuff had to be altered a little bit.....
$dbhost = "localhost";<br />$dbuname = "bla bla";<br />$dbpass = "new pass here";<br />$dbname = "name it here";<br />$prefix = "nuke";<br />$user_prefix = "nuke";<br />$dbtype = "MySQL";<br />$sitekey = "use anything ";<br />$gfx_chk = 0;
