How to stop type going from right to left from cursor

[R. S.]

In the middle of a document my cursor stopped dead and further typing started
producing letters from right to left, instead of normal progression. Help!

 

[Peter T. Daniels]

Is a right-to-left language enabled on your machine (Hebrew or
Arabic)? You may have accidentally hit a keyboard shortcut to change
input language (LeftAlt+Shift), but since you didn't change the
keyboard, you'd still be typing English letters.

Or maybe if you ever pasted something into your document, it brought
with it one of those language labels. Or you might have "Detect
language automatically" turned on.