I cannot access my addon menus

Hey all,

I've been playing Warmane on and off for years. I've recently gotten back into it a few weeks ago and noticed that my addons either won't show in the Interface menu (but will still work), and I am unable to change the options for half of them. I just downloaded ElvUI so that I can deal with less addons, but a fresh 3.3.5 install of that won't allow me to change the settings. Even trying to access the menu through chat doesn't work. If I try and type /quartz or /elvui, it is as if I am unable to press enter and the message is stuck in chat. I have tried disabling/enabling and even redownloading the addons. The only thing I haven't done is freshly install the game which I was looking to avoid, but may have to end up doing. Any help?