When I attempted my first redemption with MyPoints I ran into my first problems with them: "account disabled". They didn't notify me or anything, but thanks to Flyertalk I found a phonenumber to call (since no reactions came on my emails). Eventually it turned out they needed to verify my personal data. Apparently that is their standard practice, which I can understand. I don't understand why they cannot contact me and ask for information, but instead just block the account.
Anyway, I provided the information they needed and the points eventually posted.

A month later I redeemed more points (earned in part through the nice Amtrak offer ) and these also didn't post. After more emails and phone calls they finally posted, including the points that already posted a month earlier (my first redemption), so these posted twice.

Result is that I have a negative balance with MyPoints, but an extra 1000 points in my Hilton account