OK, so this has been resolved.  The issue is that I did not have .06629 balance - the amount showing as my balance has been rounded up.  If you hover the mouse over the amount, you will see the full amount - in my case it was .06628xxx. 
Seriously...

Anyway, I had to do that.  And to others, no, there are no fees - I can withdraw all.  See 'Our fee' in the image.  it's 0.