Attempted voiceovers, OHR went crazy..

I recorded voiceovers for some of my lines in my game and was gonna import them as sound effects to be played while the text boxes were up. They were in MP3, so the OHR had to convert. The first one went okay, but then the second one it kept importing repeatedly and got stuck in a loop. I hit escape and it went to the main menu and kept doing stuff. It drew lines on some letters in the font, changed some bitsets, and even a hero palette, god knows what else, and it saved changes. Thank god I had just backed it up. I exported the graphics I had just drawn and just replaced it with the backup. I then tried again and turned the quality down a bit. Same result, and upon closer inspection the voiceovers that did import sounded a bit slow. I'm thinking convert them to OGG using a different program if I decide to try again.