Calender plus sign has disappeared on iPad 2, so I tried the fix that was posted in this forum - I went to Settings>iCloud. It asked me to log in. So I type in my Apple ID username and password. But as soon as I did that, the panel disappeared and nothing happened. So I cannot log into iCloud, therefore I cannot fix the Calender. Is this now an iCloud problem for me?? Why can't I log into iCloud? Please help!