Stripped the wallpaper off with a steamer the plaster now has a smell there most of been 5 layers of paper that must of been on 20 odd years judging by the pattern can't explain the smell anyone any ideas
As boxy said ^^, steaming the paper off has re-awakened the gluey smell it will probably fade away if you let some fresh air into the room and let the walls dry out before re-papering.