I'm sure it is an internal problem at etherdelta, there are many people complaining that they cant do any trades there. I did try to deposit a token yesterday, but still not completed till now and it is disappeared. I tried to deposit other tokens but it fails, it says that I dont have enough balance for the gas while I'm very sure my eth is more than enough.
Maybe you are right, I see that many people are encountering the same problem. I can only say that for me everything works really good with etherdelta. The site is only sometimes a bit laggy, but deposit and withdrawal works for me as usual.