Same problem here,ipad mini4 on IOS 10.2. Update or reinstall didn't really fix the problem,only my boosters are gone.Then it worked 2or3 times,then again stuck on orange page.What solves the problem was:-Go to ios settings->Safari->Clear history and website data (Don't know if it's the exact name of the menu point since my ios runs on german)After clearing i was able to login again.
Rich Text Editor.
To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph.
An inline formatting menu will show up when you select text. Hit tab to get into that menu.
Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.