I tried to solo Reaver's Fate on hard a few minutes ago with my level 20 monk.
The fighting was easy... but when I got to the puzzle, I couldn't get the elementals to move away from the switches, and couldn't click the darn things! Or, for that matter, even mouse over them and use the keyboard to activate. So, I have to start killing them... I do so, then have time to put in two combinations before it goes boom. =)
I'm chalking this one up to bad luck, and got a good laugh out of it.