# SurveyMonkey: Major incident: TURF and Empirical Bayes not working on MaxDiff surveys

**Summary:** TURF and Empirical Bayes were not working on MaxDiff surveys in a major-impact SurveyMonkey incident that started at 2026-04-24 08:40 UTC. The incident lasted 6 h 4 min and was resolved at 2026-04-24 14:45 UTC; no cause or specific fix was stated. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-04-24 08:40 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/v84fdpzw79yb](https://stspg.io/v84fdpzw79yb)
- [Company: SurveyMonkey](https://rewindex.com/company/surveymonkey.md)
- Versions: before (none: first archived) → after incident\_version:262/tp8yfx409r12@d344a34cb593
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ TURF and Empirical Bayes not working on MaxDiff surveys
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-04-24 08:40 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-04-24 14:45 UTC
```

**6. Added: Affected components**

```diff
+ SurveyMonkey
```

**7. Added: Update** (investigating) · 2026-04-24 08:40 UTC

```diff
+ We are currently investigating this issue.
```

**8. Added: Update** (resolved) · 2026-04-24 14:45 UTC

```diff
+ This incident has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-04-24 08:40 UTC | Major incident: TURF and Empirical Bayes not working on MaxDiff surveys (this change) | outage |

All SurveyMonkey changes: [timeline](https://rewindex.com/company/surveymonkey/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


---
Canonical: https://rewindex.com/change/i1cb44a31d8d18c · Markdown: https://rewindex.com/change/i1cb44a31d8d18c.md · JSON: https://rewindex.com/api/v1/changes/i1cb44a31d8d18c · Generated 2026-10-18T02:29:17.854Z