Had this issue when open beta first began, but after the second patch, everything was fine. Durring the event tonight it showed up again.
I was holding "shift + w" and pressed rifle butt a couple of times. My character would not stop rifle butting, and the secondary function (like sniping for the phasor rifle) on the action bar disappeared. Could not change weapons, and could not do anything but move around as I was rifle butting constantly. As I did the first time, I logged out and back in. It stopped the character from rifle butting, but the secondary functions have not reappeared.
Yes, very smiler bug for me on the last day, I did my normal right click to set autofire on my ground weapon and was unable to remove it no matter how many ways I tried, then everytime I would go from space to the ground my primary and alt fire icons would be gone off the toolbar.