There is a problem logging in on mobile devices, when you come to log in there is an advert covering the log in details
If your device has saved your details you might be Ok and be able to just press the log in button.
If you need to enter or alter anything in the username or password boxes then this is where you might have trouble, Forumotion are aware of it and it seems it is a problem with the Ad servers, it has been like this for a couple of days but will be a problem tomorrow when we have the forced log-in at the beginning of each month
Only way I can get it to work on an Android device is to zoom right in as far as you can on the page, this moves the advert out of the way and lets you input text into the boxes, not sure if it will work on an Ipad.
Hope they fix it before morning