There are two bugs currently occurring in Flock 2.5.2 in regards to Flickr logging out:
Bug 17221: At some point within 24 hours (sometimes many hours, sometimes only a few), Flickr logs out.
Bug 17021: Flickr logs out when you restart the browser.
These are obviously very frustrating to heavy Flickr users, and we're going to do our best to get fixes to these issues out to you ASAP. There is no workaround in the meantime, unfortunately.
