Blair M. Thorne
I'm usually working on multiple projects at a time. So, if something isn't clicking, I'll set it aside to work on something else.
One of the many reasons I'm useless without an outline is that I often jump around a zero draft as I'm writing it. When a dialogue heavy scene is too low key for my mood, I'll hop over and wrestle with a fight scene. And sometimes the reverse.
Then sometimes I have to switch medium. If working on the computer is killing my mojo, I'll grab pencil and paper.
Really, the key is flexibility. Allowing myself ways to work AROUND the block instead of trying to mash my way through it.