I just went to my settings, changed the password somewhere in them, signed out, signed in using my gmail address and the new password, and it worked.

But yeah, flickr is buggy. The Android app on my tablet never seemed to load anything (except on rare occasions), and I uploaded a large amount of photos a couple of times, edited the names and tags, and some of the names/tags were lost. But I enjoy some of the groups there, got some good advice on buying a medium format SLR.