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That's interesting. I thought he was only pretty unsatisfied with QED and renormalization and all that. Do you have some reference, where Dirac explains his quibbles with interpretation? I always thought he belongs to the "no-nonsense physicist" type, who don't bother about metaphysics but are after the utmost clear exhibition of the mathematical structure behind the theories and models they think about, at least this is what I have read by Dirac so far (including his famous QT textbook, his papers on QT, the introduction of annihilation and creation operators and QFT, the canonical quantization of Hamiltonian systems with constraints (Dirac brackets), radiation-reaction problem in classical electrodynamics, GR (he wrote one of the shortest and best introductions to GR)).