Board Thread:Roblox help and discussion/@comment-34664392-20180211175800/@comment-30144972-20180214005021

Heard there’s a bug with discord’s overlays interfering with the controls on ROBLOX. If you have discord installed, turn off overlay or uninstall discord.

Source: https://devforum.roblox.com/t/roblox-isnt-detecting-some-keys/90963/13