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More than likely you ran out of bandwith, which happens to new users with under
15 steempower, during peak hours of steemit usage ( roughly between 12pm central pacific & 5pm cp).
I know because i ran into this problem as well, while your bandwith is really low your account is essentially frozen.
Luckily for me someone has delegated me enough steempower to get exactly 15, have not had the problem since, good luck on steemit!