Blank code lines?

I was coding normally today, but suddenly, blank lines after comments! Thousands of them!
OK now seriously, what the heck is this:

it appears after every comment with no script in it, and it came all of the sudden today. I tried re opening the file / flash but it’s the same. In a new flash file it doesn’t happen, but when I copy one of these things it does, even on a new one.
Did my Flash/FLA got screwed up, or is there a feature flash really wants me to see?

Thanks a bunch! :thumb: