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Module 3 fast-pathed out (50 episodes in 0.6s) when ``frame_provider.camera_keys`` came back empty even though Module 1/2 worked, because they use ``frame_provider.camera_key`` (singular) and were happy with the explicit ``--vlm.camera_key=...`` override. Two fixes: - ``frames.py``: read ``meta.camera_keys`` (covers both video- and image-stored cameras) instead of ``meta.video_keys`` (video-only), matching :class:`LeRobotDatasetMetadata`'s canonical accessor. If metadata still surfaces nothing but the caller explicitly passed ``--vlm.camera_key=<key>``, fall back to ``[<key>]`` — the key is by definition known to exist on the dataset. - ``general_vqa.py``: emit a one-time WARNING log when Module 3 sees zero cameras so this never silently produces zero VQA again. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>