It used to be that if you started a slash command by typing a slash (/), the chat box got focus and the slash appeared there, so that you could just type /camp desktop (or whatever) and have the command execute. Now you first have to click into a chat box to get focus before you type a slash command. This is not a good change.
Found it. Options >> Controls >> Chat Keys >> Begin Command somehow had gotten cleared. I don't know how, since I have not messed with Options in a week or three. But it's back to how it should be now.
I have to fix something in my options daily. Yesterday it was my auto loot setting which got switched to my "low level fertilizer and shiny farm" mode instead of my "there might be a mount or a rune I can give away or auction" mode. Now I have two Hivewatcher mounts. My UI disappears weekly.
Check to see which keymap is selected in keyboard layouts. I logged in the other day and mine had been switched to "other" which has all sorts of weird keys mapped.