My password contains a # symbol in it, and recently I've found that if I lock my screen and come back I won't be able to log in, forcing me to shut down the computer and try again. After one of these reboots and successfully logging in, I then tried installing something in terminal, which required me to enter my password. When I tried to install it though, I kept getting told that my password was wrong. Just out of curiosity I tried writing my password where I could see it, and sure enough instead of a #, there was a \ instead.
On an UK keyboard the button above the right shift, next to the backspace/enter button, is #, and shift+3 is the GBP symbol. But now it seems to have changed to an US layout, where shift+3 is #, and the # key is . My password is pretty long and this bug is really getting irritating, because it makes me stop and press in each key individually, which makes it take much longer to do anything. Also I need to do quite a bit of word processing as well as HTML coding, and all sorts of keys seem to have been changed, which is obviously going to be a hindrance.