Starting about a week ago, my phone -- rooted HTC Incredible, 2.2 -- stopped being able to upload to Flickr. I can't associate any system/device changes with the problem; I rooted a couple of months ago, and updated happily, since then.
I'm not using any special Flickr apps -- just the default "Share >> Flickr" accessed via the Gallery.
But when I do, I first get prompted to log in to Flickr, then told that I have multiple accounts (I don't) which is not supported.
N.B.: Question may be rephrased over time....