Windows Insider Chaos: KB5046740 Breaks Recall Feature

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Microsoft has once again found itself in a patch-fueled quagmire, prompting a need for close attention from Windows enthusiasts, especially those dabbling in the bleeding-edge Windows Insider channels. Here's the scoop: If you're one of those eager insiders who applied the final non-security preview update of 2024 (KB5046740) on November 21 and then jumped to the Dev Channel to test Microsoft's revamped Windows Recall, you may have bitten off more than your PC can chew. Microsoft has confirmed that installing this patch early could leave Recall unable to remember much of anything.
But don't worry—I'm here to unpack the details and help you understand what went sideways, what it means for you, and how to avoid a nightmarish reinstall-athon.

What Is Windows Recall, and Why Is It Making (or Forgetting) Memories?

Windows Recall, reintroduced in late 2024 after a shaky debut earlier this year, is Microsoft's AI-powered tool allowing desktops to save "snapshots" of past activities. Imagine it as your PC’s personal time machine. Recall uses these snapshots to create a searchable history of your desktop. Want to revisit a document you were editing three weeks ago but forgot the folder or name? Type in a keyword, and Recall could teleport you to exactly where you left off—brilliant in concept but controversial in execution.
The drama stems from its combination of Artificial Intelligence (AI) and a broad-reaching archival feature that some critics (and privacy advocates) have labeled a security "nightmare." Imagine if your PC's past activities became an unintentional Pandora's box...
By November, however, Microsoft was confident enough to re-launch a more polished version of Recall for their Windows Insider Dev Channel. This was supposed to be Recall’s redemption arc, promising smoother functionality and reassurances for skeptics. However, for some users, that redemption turned into an unfortunate mess before they could even fully explore it.

The Main Culprit? KB5046740 and the Dev Channel Combo

In true Microsoft fashion, the issues stemmed from quality control blindsides. KB5046740, the non-security preview update labeled as 2024's final hurrah in preview patches (ahead of December’s scheduled security update), should've been harmless. Unfortunately, the trouble started when overzealous Insiders installed this patch before hopping into the Dev Channel for Recall testing.

What Happens If You Install The Patch Prematurely?

  1. Snapshot Issues:
    • Recall fails to do its one job—saving snapshots. The dreaded "nothing happens" bug creeps in, rendering the AI-powered archival feature completely useless. Your desktop history? Gone like it never existed.
    []The Catch-22:
    • Once your system is hit with this glitch, there’s no quick fix. According to Microsoft, you may need to wipe and reinstall Windows entirely to resolve the issue. Yikes!
    [
    ]Microsoft’s (Unhelpful) Advice:
    • Official guidelines state: "We recommend you not install this preview update before joining the Dev Channel until we fix the issue in a future update." Translation? If you’ve already combined KB5046740 with Dev Channel membership, buckle up for potential chaos.

Implications: Is This Fixable, and What Should You Do?

Mitigation Steps for Windows Insiders:

If you haven't yet installed the KB5046740 update:
  • Pause Updates: Head to Windows Update settings and hit the "Pause updates" button until you're absolutely sure the patch-conflict issue has been resolved.
  • Plan Properly: Join the Windows Insider Dev Channel before installing patches, not after.
  • Regular Backups: Every Windows Insider knows the golden rule—before fumbling with Dev Channel previews, create a system image backup. It’s better to have a safety net than to learn this rule the hard way.
If you've already encountered the problem:
  1. Attempt a Rollback: You might be able to rollback the update via Update History settings. Be warned—this isn’t always successful for Dev Channel testers.
  2. System Restore (If Enabled): Check if you have a Restore Point saved pre-update. If so, revert to that.
  3. Brace for Reinstallation: While Microsoft hasn't been clear on the exact timeline for a fix, those who completely hosed their system may need a fresh install of Windows 11.

For Non-Insiders: Stay Away from KB5046740

Here's some simple advice: move slowly, not recklessly, with non-security patching—especially if preview software isn’t your thing. These preview updates demand a dev-level patience—and an even higher tolerance for bugs.

Understanding How Recall Works Beneath the Hood

Behind the alluring "time-machine" aspect of Recall lies its brain: a fusion of Artificial Intelligence and desktop indexing. Here’s a breakdown of how it’s supposed to function:
  • Snapshot Mechanism:
    • Recall actively captures real-time snapshots of your desktop (open programs, files used, and document states). These snapshots are temporarily cached, saving their metadata in a secure index.
    []AI Search Integration:
    • The underlying AI is tasked with parsing vast amounts of context from these snapshots—location, usage history, patterns—and making it intuitive to retrieve them. For instance, rather than looking for "resume_final2.docx," you can search for "job application draft" and jump directly to the relevant file based on usage patterns.
    [
    ]The Problem Area:
    • What happens when the indexer fails or loses permissions after patch conflicts? As seen with KB5046740, even an incremental "innocent patch" can cripple compatibility between Recall and its dependencies. Worse yet, memory-heavy features like Recall can drain system resources if poorly implemented.

Recall’s Troubled Legacy: The Privacy vs. Innovation Debate

Even before the patch problem, Recall was under heavy scrutiny from privacy hawks:
  • Potential for Data Mining: Some users fear the obvious—a tool like Recall, integrated with AI, could theoretically collect user insights without clear consent. Although Microsoft vowed transparency, skeptics remain unconvinced.
  • Security Exploits: Could desktop snapshots—or their index—be targeted by malicious actors? Recall’s earlier iterations were criticized for lax security, so this is no far-fetched worry.
Yet, to its credit, Recall is also the face of Microsoft's larger push to redefine desktop productivity. As AI-powered PCs (like Copilot+ PCs) hit shelves, tools like Recall aim to show off cutting-edge advancements.
But as critics love to point out: When the cutting edge starts to crack, users pay the full price.

Final Thoughts: Is the Insider Lifestyle Worth the Risk?

Whether it's Recall’s memory fails or KB5046740's accidental demolition derby, one thing is clear—preview updates in Windows Insider channels are for thrill-seekers only. If you’re not prepared to nuke your PC from orbit when (not if) something goes wrong, there's no shame in playing it safe on a stable build. Microsoft might be racing to fix this bug, but as they say in the land of IT, never be the one to test the patch waters first.
The safer bet? Sit tight until 2024’s official production build of Recall drops—and, even then, keep that system restore button handy. Want innovation without implosion? Sometimes good things come to those who wait.

Source: The Register Microsoft says premature patch could make Windows Recall forget how to work