I noticed that a file I was working on was suddenly four times its original length — its content had been quadruplicated! I also noticed that whatever I changed in the first copy affected the others, even after I emptied out the file and started typing fresh.
After a relaunch, everything’s back to normal, but… what the heck was happening? Is it the rapture?
Video demo: http://dl.dropbox.com/u/25234/textmate-dupe-lines-what.mp4