Yes, the same thing happened to me.  I spent hours and hours on this forum but never registered.  Tonight I actually could of won 10 000 atom coins giveaway, but alas I am a newbie and I spent a good 30 minutes trying to figure out why I cannot reply on the that specific thread, to my horror I realized there is newbie restrictions

Atom Address
EKdSQhRQ1vaqBY98M9RKudfGNWND3DNJ9b

I could of won 10 000 atom coins, as I already spent hours on this forum but never registered.  The one day I actually had an opportunity to win a free coins..the forum rules destroyed me from posting on the winning thread

EKdSQhRQ1vaqBY98M9RKudfGNWND3DNJ9b

I tried to post my address but forum would not allow me due to Newbie rules

EKdSQhRQ1vaqBY98M9RKudfGNWND3DNJ9b

I could of been one of the lucky 100