As noted, the form submits but the data doesn't go into the db. Looking at the rendered HTML, I notice a missing XID. I think this is what is causing the problem - anyone know why this would happen?
{exp:comment:form channel="articles" entry_id="{embed:entry_id}"}
{if logged_out}
<label for="name">Name:</label><input type="text" name="name" value="{name}" size="50" /><br />
<label for="email">Email:</label> <input type="text" name="email" value="{email}" size="50" /><br />
{/if}
<label for="comment">Comment:</label>
<textarea name="comment" cols="70" rows="10">{comment}</textarea>
<label><input type="checkbox" name="save_info" value="yes" {save_info} /> Remember my personal information</label>
<br />
{if captcha}
<label for="captcha">Please enter the word you see in the image below:</label><br />
<p class="captcha">{captcha}<input type="text" name="captcha" value="{captcha_word}" maxlength="20" style="width: 200px; float: left;" /></p>
{/if}
<br />
<input type="submit" name="submit" value="Submit" />
{/exp:comment:form}
Source:
<form id="comment_form" method="post" action="http://domain.com/newsroom_article/core-to-corporate">
<div class="hiddenFields" style="display: none;">
<input type="hidden" name="ACT" value="29">
<input type="hidden" name="RET" value="http://domain.com/newsroom_article/core-to-corporate">
<input type="hidden" name="URI" value="newsroom_article/core-to-corporate">
<input type="hidden" name="PRV" value="">
<input type="hidden" name="XID" value="">
<input type="hidden" name="entry_id" value="3327">
<input type="hidden" name="site_id" value="1">
</div>
<label for="name">Name:</label><input type="text" name="name" value="" size="50"><br>
<label for="email">Email:</label> <input type="text" name="email" value="" size="50"><br>
<label for="comment">Comment:</label>
<textarea name="comment" cols="70" rows="10"></textarea>
<label><input type="checkbox" name="save_info" value="yes"> Remember my personal information</label>
<!-- <label><input type="checkbox" name="notify_me" value="yes" /> Notify me of follow-up comments?</label> -->
<br>
<label for="captcha">Please enter the word you see in the image below:</label><br>
<p class="captcha"><img src="http://domain.com/images/captchas/1354086872.7556.jpg" width="140" height="30" style="border:0;" alt=" "><input type="text" name="captcha" value="" maxlength="20" style="width: 200px; float: left;"></p>
<br>
<input type="submit" name="submit" value="Submit">
</form>