Mailer Plugin doesn't add to queue or process queue after nightly release upgrade

We initially had this same issue described in this post - www.joomlapolis.com/forum/277-cbsubs-gpl-support/230244-solved-5416-mailer-queues-but-wont-send-mail?limitstart=0#266410

The emails were added to the queue but they would not send, and according to the cron there were no emails to be sent.

As instructed in the above forum post, I installed the latest nightly release for both CB Subs and the Mailer plugin.

After this upgrade, now neither process is working - run mailers, nor process mail queue. No emails are being added to the queue.

I thought perhaps this was because the emails we are expecting to appear in the queue were added to the queue prior to installing the nightly release, so they've been flagged as already processed? I cleared the queue after the installation, so we could then run the mailers and the queue with the latest version.

Could the issue now be that all current emails have been 'flagged' as already queued, and if so, how do we clear the mailer history 'flags'?

You can delete emails from the message queue by navigating to CBSubs > Mailer > Messages Queue then selecting an email and clicking delete. If the emails have already sent then they're marked sent and won't send again unless the conditions allow for that.

You may have misunderstood my explanation ...

I have deleted all emails in the queue because before upgrading to the nightly release the queue wouldn't process to send the emails.

I upgraded to the night release and then tried processing the mailers again so the queue was reloaded, but now no emails are being added to the queue.

I've informed Beat of your issue so he can review further. We're currently unsure what's causing the queue to stop processing or why it suddenly starts working again (happened in the other support topic). Appears it could be time based and likely a broken datetime calculation somewhere.

Will there be an update to this post soon? We are in a critical dilemma since none of our subscription "welcome" nor "renew" notifications are being sent out.

Any update on this? This is of critical importance!

We've gone through the process again of installing the latest nightly build (3/3/16) of CB and CBSubs, plus all plugins, in hopes that a fix had been released without our knowledge, but still no luck.