Honestly I have had lot's of problems with text editor It's clear that some nasty bugs remain in TextEdit and have existed in it for years. It will sometimes not show the top of the document, (You scroll all the way up but it stops well before the top of the document) closing and opening the text document will fix it temporarily. It will hide also often hide a chunk of text in the document but often this get's resolved by clicking somewhere in the text before the hidden text and pressing the return It's super annoying when you don't realize it is doing it and make a mistake as a result. I am using it with just plain text (code) with no special formatting and it works okay most of the time but not a single day goes by without some problems with TextEdit. I really hope apple fixes it because it's super annoying when you work with a lot of large text files like I do. But I get it, plain text is such a new and complex thing, maybe one day, with enough funding and advanced CS Research Teams Apple will crack the enigma that is "plain text" (Aka "the plain text problem") and work out how to handle plain text in a consistently reliable way sometime in the next 50 years or so... =-|.