I'm currently running a Xubuntu image using VirtualBox and a strange issue just started occurring: I cannot enter a or c in a terminal or terminal emulator. A and C (that is, a/c + left/right Shift or with Caps Lock active) work just fine, and a/c work fine in graphical applications; it's only when using the full terminal or
xterm that the keys don't work. This seems to be a user-specific thing, as I can use
c just fine when entering the user name for login at a terminal but once logged in the keys no longer work; however, I cannot figure out what settings I changed to somehow cause it.
Additional info: the characters are also filtered when pasting text into a terminal emulator; for a moment, I was able to get
a to paste as part of a string when it was at the front, but I'm no longer able to.