Can't edit since installing 4.5.3

Do you get an error?

What browser are you using?

Please check for errors in the browser console when you attempt to edit a page/post

https://msdn.microsoft.com/en-us/library/gg589530(v=vs.85).aspx or
https://developer.microsoft.com/en-us/microsoft-edge/platform/documentation/f12-devtools-guide/ if you’re using “Edge”

There are a couple of possibilities here:

1. There’s some sort of conflict with your theme or plugins. To test this disable *ALL* plugins and change the theme to twentysixteen. If the problem goes away, it’s a conflict. Re-enable things one at a time until the problem recurs, then let us know what’s doing it.

2. The 4.5.3 upgrade did not install completely. Follow the steps for a manual upgrade and see if that fixes it.

What theme are you using? Where did you get it?