What has gone WRONG in the user's editor — renders that failed or stopped, footage that would not decode, chunks that could not be prepared for playback, exports that failed — each with WHERE (the timeline and frames, the source and its own frames, the footage and frame the engine could not decode) and the reason in the engine's own words. You also hear about new problems for free: every other tool result carries a problems list of what changed since your last call. Call this for the whole history, or after a moreProblems count. A problem that is open on a timeline means that timeline does NOT play or export correctly there, whatever inspect_timeline showed: fix the named layer (e.g. update_motion_composition) before calling the work done. state is open | fixed | superseded (the thing it was about was edited and not yet re-rendered — NOT proof it works) | dismissed.