Text disappears/is hidden when editing large blocks of text

[happyslayer]

Hey all,

In the last few days, I have noticed a really annoying issue. While typing in several different programs, large portions of text will just disappear or be hidden for a while, usually after hitting the delete key.

For example, I have been using Scivener a lot lately (it is NaNoWrimo this month.) When editing a large block of text -- in this case about 1500 words --whenever I hit the delete key while editing, all of the paragraphs below the sentence I am on disappear. They are not deleted, just sort of hidden. Scrivener still says all the words are there. Then if I continue to type, the words will reappear... often if I hit the return key. But hit delete again later and they will disappear again.

This happens in Storyist and OmmWriter as well. So it is not a Scivener issue.

Using Word 2016 and it works fine, though I think Word has its own text handler.

Does anybody have any ideas?

I am on the latest version of OS X Sierra 10.12.2 beta. I realize this may just be a beta issue but I am checking with you all just in case.

I have also tried several different resolutions in case it is a display issue.

Thanks in advance.

 

[happyslayer]

UPDATE: Apple fixed this for me with the second beta release, last night, of 10.12.2