Crashing
The people complaining about it crashing since the latest update are correct. Someone mentioned tesseracts, other pages such as the uncertainty principle and the letter M have the same crashing problem. They also have the same thing in common, animation on the page. The new version cant handle opening pages with animation and cause the whole thing to freeze and will not reset after swiping out. Since you cant tell what pages have animation on them before attempting to open them, this is a pretty much app ruining bug.
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Wikipedia