Have you invested in any loans?
Yes, and 1 of 3 is repaid now.
You can't withdraw any of your coins you send to your account while it is invested in loans.
I try to withdraw coins which are not invested
I see a lot of negative stuff about BTCJam lately , It's weird how they all came out suddenly .
anyway mate , check this thread out :
https://bitcointalk.org/index.php?topic=112447.1320;topicseen , you may get an answer shortly because It's their official thread however seems like OP didn't connect since the Hack of the forums or after it of couple of days . (26 May)