pco,
I was able to reproduce the problem. I've been trying to figure out whats causing it for the past 2 hours but haven't had any luck. I'll look into it some more this weekend but I dunno if I can fix it or not. For now, a temporary solution would be to hide the quick edit icon from those who use Opera.
To disable it in opera open the postbit templates and find:
Code:
<if condition="THIS_SCRIPT=='showthread' and $post['editlink'] and $bbuserinfo[userid]>0">
$quickedit
</if>
Replace it with:
Code:
<if condition="THIS_SCRIPT=='showthread' and !is_browser('opera') and $post['editlink'] and $bbuserinfo[userid]>0">
$quickedit
</if>
I know thats not the solution you were hoping for but at least those who use other browsers can still quick edit until I figure out a fix.