Welcome to TVPaint Community forums !

Here's my scenario:

I've got three frames. The first and last frame both have an image on them.
I'm drawing on the second frame using the Light Table as a guide.
The image of the first frame shows up with the Light Table. But the image for the last frame does not.
However, when I click on the last frame, I can see the two frames before it.

I've tried adjusting the settings on it but I still can't get it.
I'm afraid I'm just screwing around and missing an obvious solution.
And help is appreciated.

Open the lighttable panel and check which colour is chosen for the frames ahead - if it's the same colour as you background, they will appear invisible.
Of course you have checked which frames shall be visible (checkbox on top of each frame fader)?

I just figured out the problem.
The first two frames are on as Image Layers.
The third is an Animation Layer.

Thank you for your help though.