[stardotstar]

First step to improve this slightly - I have put a warning up in the template which tells users that PM Quick Reply is a Reply-To-All...

The template is pm_showpm

I've reproduced it here with the small text amendment I made in red.

<if condition="$show['quickreply']">
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center">
<thead>
    <tr>
        <td class="tcat">
            <a style="float:$stylevar[right]" href="#top" onclick="return toggle_collapse('pm_quickreply')"><img id="collapseimg_pm_quickreply" src="$stylevar[imgdir_button]/collapse_tcat$vbcollapse[collapseimg_pm_quickreply].gif" alt="" border="0" /></a>
            $vbphrase[quick_reply]-to-all: $pm[recipients] -----> ATTENTION: use normal reply (above) to reply to sender only!!
        </td>
    </tr>
</thead>

This is only the quickreply section - I have added $pm[recipients] to show who its going to... That may include the hint for how to fix this. I'll work on it.

Will