No, John Carmack didn't get bored and go back to fix bugs in doom2.exe, but instead some hardcore doom2.exe deathmatchers decided to. Apparently all this time there's been a problem in the demo recording code that caused mouse precision to be lower than normal, and some enterprising hackers decided to fix the problem, resulting in an unofficial doom2.exe v1.91. If you didn't even realize that demo recording in doom2.exe had mouse precision problems, then this probably isn't for you, and if you did, then you probably knew about this already, so I don't even know why I am writing this. Anyways cph has another writeup explaining this bug and its fix in detail. I love you cph! Call me!