Recently, I needed to edit the date of a post. As I did that, I got an error message about a xxx_edit.php file (but didn't catch exactly which file). At least since that date, and perhaps even before that, Google Analytics hasn't captured a single hit on my website, even though I've even visited it from my own mobile (rather than as the admin). So, I finally had a chance today to look around for that xxx_edit.php file and see if something was obviously broken. What I do see is that in the edit.php file under wp-admin, the last line about ABSPATH does _not_ end with ?> like I would have expected based on looking at other lines of code in the php files. I'm not very familiar with php, but this just doesn't look right. If this is incorrect, then somehow 2 of my sites became corrupted in this same way.
Please advise.