I think I may have worked out why skritter has become so discouraging at the moment. After a week or so of not being able to study, I have come back and in any 10-15 minute block, half the words I can't remember, which is fine, but the longer I study those words I have forgotten still don't come back. So instead of feeling the satisfaction of re-learning, I just have a continual feeling that I have forgotten everything.
Is there a way to make words you cant remember come back in the same review session?
I think what is happening now is that I might tick 50 words as wrong, then not see them again for another 24 hours, at which point I have forgotten and have to tick them all wrong again.