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Twisty said:What you'll want to do is delete ...
B_Convert = '$convert_q',
Now again, I can't say for sure that this is exactly how the 6.5 script works but it has to be something very similar.[/]
I ran into this on a board i frequent; in 6.5 reguardless of your html on/off settings it it hard-coded that only Administrator can edit a post in html, all others are escaped prior to the database update

modifypost.php (line 175)
<br />// -----------------------------------------------------<br />// If HTML is off then we get rid of < and > in the body<br />if ( [:"red"]($user['U_Status'] != "Administrator")[/] || ( ($convert != "html") && ($convert != "both") ) ){<br />$PrintBody = str_replace("<","& lt;",$PrintBody);<br />$PrintBody = str_replace(">","& gt;",$PrintBody);<br />}<br />else {<br />$PrintBody = preg_replace("/<!--(.|\n)*-->/","",$PrintBody);<br />}<br />