Sendy stuck at 140 emails when sending campaign

This is the first time I send a campaign after upgrading to 1.1.7.

Only 140 messages (of a little bit less than 6000) were sent, and Sendy is stuck for 4h in that state.

SES allows me to send 50000 emails per day, and I have 49700 available for today.

Cronjobs are working fine, and the server is configured to allow up to 512MB per PHP script.

Unfortunately there are no resume, pause, stop controls, I don't know what to do to restart my campaign.

Thanks in advance for any advice.