Unless the binaries are damaged (which could only happen in case of a failing disk or something like a virus modifying them), removing the config should be enough. My approach is back up darktablerc, then delete the first half, then retry. If the problem is gone, restore the file, and delete the first quarter, and retry; otherwise, keep the first half, delete the second. Once you identify the failing region, halve it, and continue until the relevant line is found. Given that my darktablerc is a bit over 1000 lines, this theoretically takes about 11-12 steps. Given that many of those lines belong to the same area (e.g. with the prefix lua/script_manager or plugins/darkroom/<some module>/<some>/<setting>, one can often use common sense to avoid ‘bisecting’ those.
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