I just noticed that the Text Render actor has a new billboard icon (a square with a capital T and a lower case t in it) that is shown in the viewport. This wasn’t there in UE4.
The problem is, this new billboard now covers the text you are trying to read. I know the billboard is hidden in game, but that is not the issue. The problem is when you are trying to label things in the editor for yourself. You now have this billboards covering half your text. It is also an issue when loading assets from the marketplace as often the asset creator will use Text Render actors to place instructions and such in the sample level. Now these billboards cover the instructions.
Please Epic, hide the billboard icon in the editor.