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Three independent issues made all 72 musrview-* ctest targets fail on a RHEL9 box while passing elsewhere: - Pixel-diff tolerance (1%) was tighter than needed; bump to 3%. Real diffs against the committed reference PNGs measure ~0.08%. - find_package(Python3) picks the highest-versioned interpreter on the system, which on this machine is a bare /usr/bin/python3.14 without Pillow/numpy installed, while the distro's python3 (3.9) has both. Probe the interpreter CMake found and fall back to PATH's "python3" if it lacks the required modules. - musrview reliably writes and closes the PNG before exiting, but under ctest (not reproducible via a plain shell loop) the new directory entry could take several seconds to become visible to the checking script's glob(). Poll for up to ~15s instead of failing on the first empty glob.