I can't login to the site anymore and alot of others too. Is it a scam?
The site is having a problem today and there are lots of numerous complaints about that.
We don't know what's the catch here. We can't assume just because of this that they are a scam
"for now". Like other exchanges, they have also complaints about lost funds. No update yet even at their twitter page.
You can also check their ANN thread for others feedback:
https://bitcointalk.org/index.php?topic=378827.940