This maintance is due to the fact the patch was messed up and easered the data.saf and data.sah in client the problem is getting fixed as we speak the next patch will be huge due to the fact it have to replace the data.saf and data.sah.
You can fix this yourself if you dont wish to wait for patch
Re extract the client and re do the autopatch from the website.
The next patch will be about 750MB so it will be huge.