Just warn people that it's case sensitive when they make it - and warn them in big, bold letters.
I was lucky both of mine had easy-to-guess capitals, but while case sensitivity is welcome extra security, knowing you're inputting something case-sensitive always helps, because you'll remember what it was.
I've tried getting my password recovery hint answer to work and it isn't. Just...isn't. And I've tried every variation. Mind, the answer is an easy one and I wrote it down, case sensitively.
And its still not letting me get my WS back. >.< I've been waiting for days on a new response from support and haven't gotten any. Any idea what to do other than call them up? (Because... I can't call them up. I'm in the Philippines...)