It’s funny that you say your file had been changed. Because yesterday I also noticed that the comment box was missing on my blog. So I went into the options and saw that sure enough the “disable comment box” (or something like that) had been clicked.
But I’m 100% sure I hadn’t done it.
I also had some problems with my password the other day.
So I’m thinking is this some sort of hacker? I’m with bluehost, so I guess I need to contact them ….