DW,
What you report indicates a possible cron task issue and may not be related to your inability to resume a stalled queue. 
I suspect something else now - as my lm_sendp table has my Dailymail reports in it from the last 4 days?   I've posted another thread about this, perhaps there is something else wrong?  Anyway, if I can get the jammed up lm_sendp table to re-send the Dailymail reports, then I should be back in business??