Every withdrawal attempt gets the notification "address invalid", even though the addresses I try to withdraw to are valid.
I have helped some people withdraw DEM.
can you tell me how can you help withdraw

?
i make withdraw and now
status is
BTC withdrawal queued a day ago
my balance is 0 and there is no money on destination adress

I deposit DEM, then notify the people. They are able to withdraw then.
For example,
I deposited 2,048 DEM on 2014-05-14.
If you try to withdraw when the wallet is empty, your funds go into the queue. Some people claim that they remain stuck.