poloniex -can't withdraw

[dinzerillo]

I can't withdraw MXR anyone else having this problem?

[Zocadas]

I can't withdraw MXR anyone else having this problem?

I think, you mean XMR (Monero). The XMR wallet is not under maintance and you should be able to withdraw. Why you can't withdraw, could have many reasons (ID verification issue, slow network, not confirmed withdraw via email link, minimum withdraw limit not reached and so on).
To get useful advices, you may provide more infos. What do you get as output? Did you already withdraw or did you get an error during withdraw procedure?