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When I create keys for the shaker motion effect it seems to only happen to one layer even when I have All Layers chosen. what am I missing?

Nothing. You must be the first person with the need to shake all the layers.

@Paul : I think jbird013 is talking about the FX, ot the [a] tip

@jbird013 : hmm, that's weird. What's your TVPaint Animation version ? Did you update it recently ? The last version is 10.5.5

Our version is 10.5.2

I want to create the effect of a camera shake. Maybe there is a different way to do it?

For me, (10.5.4, 64 Bit, Win7) it works well, even when the layers have different lengths.

jbird013 wrote:Our version is 10.5.2

I want to create the effect of a camera shake. Maybe there is a different way to do it?

Ah! You are talking about creating a camera shake effect in your animation but are using the shaker effect which is designed to help us locate the layer we are currently sitting on by shaking it a bit (as in, here I am!). This effect has nothing to do with what appears within your drawings. As far as I know, there is nothing in TVP to create what you want to get except to program it in the camera move graph.

Simple workflow:
Render all layers which you want to shake to an image sequence.
Re-import this sequence and use the Keyframer to create a shake.

Take care to make your original project a bit larger than your final format.

Since you are on 10.5, to what slowtiger says, you have another option of simply setting "all layers" in KeyFramer's window at the very bottom "Apply on" windows. This eliminates the need to create an image sequence.