Neither of my characters will jump.

It seems like if this were a game issue people would be losing their minds on the official forums, so I thought I'd check here to see if this is a result of the fact that I'm dual-boxing? Interestingly, the jump action IS enough to break the /follow bug when one of my characters gets stuck and runs in place, but they don't physically move.

I've changed the hotkeys and everything. Anyone else experience anything similar?