Ok, my system is fully updated. I enabled the Gwibber plugin (clicked "Gwibber", it took a few seconds before the checkbox was updated and the Gwibber plugin settings appeared). Kupfer crashed after a few seconds. I started it again, went to the plugins window again and Gwibber was disabled. With Gwibber disabled, kupfer stays up.
Ok, my system is fully updated. I enabled the Gwibber plugin (clicked "Gwibber", it took a few seconds before the checkbox was updated and the Gwibber plugin settings appeared). Kupfer crashed after a few seconds. I started it again, went to the plugins window again and Gwibber was disabled. With Gwibber disabled, kupfer stays up.