I've found out what the problem was. First error: I used imag(z) but I had to use flip(imag(z)). I had a formula describing the translation, but my the formula was not dynamic and Ultrafractal thought it was. this created an endless loop. Ultrafractal would always say it expected a ')'. I've now got a very simple solution: z= z^2 + #pixel z = real(z) + 2*flip(imag(z)) That does the trick.

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