It seems that Poloniex will hold your money hostage unless you make a forum post about it. See:
https://bitcointalk.org/index.php?topic=1893008.60https://bitcointalk.org/index.php?topic=1907457.0https://bitcointalk.org/index.php?topic=1907678.0https://bitcointalk.org/index.php?topic=1834015.0So this forum post will stay up until Poloniex has returned my $6,439 USD.
A few days ago around May 10th, Poloniex experienced a DDoS attack and had trouble processing withdraws, understandable. However a week later, people were still having trouble withdrawing. So, on May 21st I tried a small withdraw of .001 btc. Hardly a large amount and definitely not over any withdraw limit. 24 hours later, no response. Mods in trollbox say to wait and be patient. I file a support ticket. Everyday I ask the mods to bump my support ticket and still no response from support. So the way I see it there is a problem because Poloniex is not being transparent. No one has any idea why Poloniex is freezing withdraws. In anticipation of typical responses to this thread:
1) "You withdrew over your limit": .001 BTC is hardly an amount that should trigger "OMG that's a huge withdraw!" flags.
2) "They usually respond in 24 hours, but resolution can take 3-5 days": IT HAS BEEN 10 DAYS and not a single response not even in the first 24 hours. No explanation. None.
3) "I am having no problems withdrawing, you must be overreacting": The problem is that poloniex is not being transparent about why they are holding withdraws. This means that at any moment they might choose your account to be frozen too. I was having no problems with withdrawing... until I did.
So after 10 days of asking poloniex to give me my money back, I am done. I will check my wallet everyday for a successful withdraw. If it does not, poloniex has officiallly stolen $6,439 USD of my money.
13 days later, my withdraw has been processed. I made a 2nd withdraw and that was processed right away. I am glad it was resolved but I am still wary. No real explanation for the delay was offered. I have decided to keep this post up to let other users know that Poloniex may hold their funds from time to time.