Hello,
I modified the options for the message delay, however it seems that I've not correctly done so.

<br />
                //changed these options significantly<br />
		echo '<select name=&quot;period&quot; style=&quot;width: 40%;&quot;>';<br />
		echo '<option value=&quot;0&quot;>Send immediately</option>';<br />
		echo '<option value=&quot;1&quot;>1 days</option>';<br />
		echo '<option value=&quot;3&quot;>3 days</option>';<br />
		echo '<option value=&quot;7&quot;>7 days</option>';<br />
		echo '<option value=&quot;14&quot;>14 days</option>';<br />
		echo '<option value=&quot;30&quot;>30 days</option>';<br />
		echo '<option value=&quot;45&quot;>45 days</option>';</p>
<p>		for($n = 60; $n <= 600; $n+=60) {<br />
			echo &quot;<option value='$n'>&quot;;<br />
			switch($n) {<br />
				//case 0: 	echo __(&quot;Send immediately&quot;, 'automessage');<br />
				//			break;<br />
				//case 1: 	echo __(&quot;1 day&quot;, 'automessage');<br />
				//			break;<br />
				default:	echo sprintf(__('%d days','automessage'),$n);<br />
			}<br />
			echo &quot;</option>&quot;;<br />
		}<br />
		echo '<option value=&quot;365&quot;>1 year</option>';<br />
		echo '<option value=&quot;730&quot;>2 years</option>';<br />
		echo '<option value=&quot;1095&quot;>3 years</option>';<br />
		echo '</select>';<br />
		echo '<input type=&quot;hidden&quot; name=&quot;timeperiod&quot; value=&quot;' . $editing->timeperiod . '&quot; />';<br />
		echo '</td>';<br />
		echo '</tr>';<br />

For all of my manually entered and "custom" delay lengths, I don't have the 'automessage' part. I actually don't even know what that is. This is my best guess why the plugin is failing to send the messages to users (i.e. they are just building up in the queue at the moment and not sending). Additionally, when I go to edit action, the "set" delay doesn't carry into that screen and it asks me to set the value again (I have the custom delay in that area, too).

I just changed it to this... should this fix the problem?

<br />
                //changed these options significantly<br />
		echo '<select name=&quot;period&quot; style=&quot;width: 40%;&quot;>';<br />
		echo __('<option value=&quot;0&quot;>Send immediately', 'automessage', '</option>');<br />
		echo __('<option value=&quot;1&quot;>1 day', 'automessage', '</option>');<br />
		echo __('<option value=&quot;2&quot;>2 days', 'automessage', '</option>');<br />
		echo __('<option value=&quot;3&quot;>3 days', 'automessage', '</option>');<br />
		echo __('<option value=&quot;7&quot;>7 days', 'automessage', '</option>');<br />
		echo __('<option value=&quot;14&quot;>14 days', 'automessage', '</option>');<br />
		echo __('<option value=&quot;30&quot;>30 days', 'automessage', '</option>');<br />
		echo __('<option value=&quot;45&quot;>45 days', 'automessage', '</option>');</p>
<p>		for($n = 60; $n <= 600; $n+=60) {<br />
			echo &quot;<option value='$n'>&quot;;<br />
			switch($n) {<br />
				//case 0: 	echo __(&quot;Send immediately&quot;, 'automessage');<br />
				//			break;<br />
				//case 1: 	echo __(&quot;1 day&quot;, 'automessage');<br />
				//			break;<br />
				default:	echo sprintf(__('%d days','automessage'),$n);<br />
			}<br />
			echo &quot;</option>&quot;;<br />
		}<br />
		echo __('<option value=&quot;365&quot;>1 year', 'automessage', '</option>');<br />
		echo __('<option value=&quot;730&quot;>2 years', 'automessage', '</option>');<br />
		echo __('<option value=&quot;1095&quot;>3 years', 'automessage', '</option>');<br />
		echo '</select>';<br />
		echo '<input type=&quot;hidden&quot; name=&quot;timeperiod&quot; value=&quot;day&quot; />';<br />
		echo '</td>';<br />
		echo '</tr>';<br />

Thanks!