About the plugin… Please take a look in the folder {$files_dir}/scheduledTaskLogs/, and check if you have files starting with PKPPNDepositorTask-.
If not, then looks like your system is not running the scheduled tasks, I’d recommend to enable the Acron plugin (if it’s already enabled, there’s an option to reload the tasks, see the image below).
If you have such files, send me the content of the newest, and also the entries of one day ago from the error.log file of your server (the plugin runs once per day, so the content of one full day is enough).
Best,
Jonas Raoni