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I did all updating on the EDT. The JPanel looked fine when rendering, no frames were wrong.

All I had was a JFrame which I added one JPanel to. When I switched to a Canvas I just had one JFrame with one Canvas on it. The only thing I changed in the rendering process was how I obtained the...

Not saying JComponents are bad or anything, if it's working for you then stick to it.
I had an old game project once which used JPanels and repaint() for rendering. However, I noticed it started...

JComponents uses passive rendering (which means you have to wait for the EDT to render the JComponent).
With a Canvas, it's very easy to set up a BufferStrategy. You then use that BufferStrategy to...

I thought Canvas was the only way to get direct rendering with Java2D?