reverb won't work

[ilovekittiesmeowmeow]

i try to set the "time", "delay", and "Wet". when i press "apply" nothing happens but it says "undo add reverb" in edit. before it worked but now it doesn't do anything and i don't know why the editor fucking hates me. why is it doing this. what did i do to deserve this stupid issue. please fix it so i don't smash my computer please. i fucking hate this and i want it fixed. i started to think maybe it's the link / song i'm editing but now i think it's the website itself or the consequence of me using the "Reverb" too much in my past song edits... i don't want to break my computer PLEASE FIND A WAY. i tried changing the "time", "delay", "wet", tried to restart, shut on and off my computer, use different types of the song, i tried EVERYTHING.