Hey,
From what I can tell, a trainer is messing with ELS. Scroll Lock is used by Simple Trainer (5.1) to teleport to your waypoint. To disable this, it's quite easy, I think you have to go into the first menu on the trainer, then from there go to the second menu under that section and it should be under there. That is, of course, provided you actually have the trainer xD
Anyways about the Ctrl+P issue, unless you change the keybinding in the ELS, it will remain, as in the vanilla game one of the default buttons to bring the pause menu up is to press P.
I hope I have been of some help