[Tails-dev] Persistent Volume Problem

Hi friends (and sorry for my English),

I have got Tails 0.21 on USB stick. I have created a persistent volume
with it. But now, I can't open the persistent volume. I have choosed Yes
for "Use persistence?" and entered the passphrase. After that, I waited
for a while. But nothing happens.

Is this a bug or I make something that wrong?