First Thanks for nice plugin. i recently update my wordpress to 3.8, after update wordpress, plugin stop automatic posting, manual posting is fine.
i install crontrol plugin & can see dg_tw_event_start on cron list, when i click on run now it's show
Successfully executed the cron event dg_tw_event_start
here is the screen showing
dg_tw_event_start  2013/12/16 15:21:00 (2 minutes 29 seconds) 10 minutes Edit Run Now Delete
I use updated version of your plugin
Thanks for your support