Intent: troubleshooting (informational, fix-first). Archetype: symptom-triage diagnostic. Three things before the article:

Cannibalization: I can’t see your content map. If you already have a page on “Maccy not pasting” or “Maccy Accessibility permission,” this overlaps heavily with it. In that case merge this in as a section, or keep it distinct by owning the after-an-update trigger. Please confirm.
Verification: I checked the paste FAQ, macOS 14 minimum, default hotkey, defaults keys and bundle ID against Maccy’s README and GitHub issues.
Open items: Anything I couldn’t confirm is tagged , and the full list is at the end.
Maccy Not Working After a macOS Update? Here’s the Fix

The toggle says Maccy has Accessibility access. Maccy App disagrees.

If your clipboard history still opens but picking an item no longer pastes into the app you’re typing in, you’ve almost certainly hit the most common post-update failure. It’s fixable in about two minutes.

Quick answer: After a macOS update, Maccy Mac usually stops pasting because macOS has silently invalidated its Accessibility permission, even though the toggle still looks on. Remove Maccy Clipboard from System Settings → Privacy & Security → Accessibility, quit and relaunch it, then grant access again. If that fails, reset the permission with tccutil and restart.

First, identify your symptom

Different failures need different fixes. Find yours:

What you see	Most likely cause	Go to
History opens, but selecting an item doesn’t paste	Stale Accessibility permission, or “Paste automatically” is off	Fixes 1–3
The Maccy shortcut does nothing	Hotkey conflict or a stuck app state	Fix 4
New copies aren’t showing up in history	Ignore mode is on, or the app is ignored	Fix 5
Everything is broken or the app crashes on launch	Outdated build, or a damaged install	Fix 6
The 30-second test

Open Maccy with its default shortcut, ⇧⌘C. Select an item, then press ⌘V yourself in a text field.

If the item pastes manually, Maccy is working. It copied the item to the system clipboard but couldn’t send the paste keystroke for you. That points to permissions, not a broken app. Users reporting this exact pattern on GitHub describe the same thing: the content is in the clipboard and only auto-paste fails.

Fix 1: Confirm “Paste automatically” is on

Maccy’s own FAQ lists this first. Open Maccy’s Settings and make sure Paste automatically is enabled. If it’s off, Maccy only copies the item and leaves the pasting to you. It’s rarely the update’s fault, but it takes five seconds to rule out.

Fix 2: Remove and re-add Maccy in Accessibility

Maccy’s FAQ also requires Maccy to be listed under Privacy & Security → Accessibility. After an update, being listed isn’t enough. The entry can be stale.

Open System Settings → Privacy & Security → Accessibility.
Select Maccy and click the − button to remove it.
Quit Maccy completely (menu bar icon → Quit).
Relaunch Maccy from /Applications.
When macOS prompts, grant access. If it doesn’t prompt, click + and add Maccy manually.
Quit and relaunch Maccy once more so the grant takes effect.

Don’t just flip the existing toggle off and on. That often leaves the broken entry in place. Removing it forces macOS to create a fresh one.

Fix 3: Reset the permission with Terminal

If Fix 2 didn’t work, clear macOS’s stored permission state for Maccy only. Maccy’s bundle identifier is org.p0deje.Maccy:


bash
tccutil reset Accessibility org.p0deje.Maccy

Then restart your Mac, launch Maccy, and grant Accessibility access again.

Two cautions:

Always include the bundle ID. Running tccutil reset Accessibility on its own resets the permission for every app on your Mac, including window managers and automation tools.
Some users on Apple’s support forums report sudo tccutil reset failing with an error after an upgrade. Try it without sudo, and if it still fails, restart first. Persistent failures can mean a deeper privacy-database problem, and testing in a fresh user account will tell you whether it’s account-specific.
Fix 4: The shortcut doesn’t open Maccy

If ⇧⌘C does nothing:

Restart Maccy.
In Maccy’s settings, reassign the hotkey. Maccy’s FAQ describes this as the fix when macOS claims a combination is already used by a system setting. A new macOS release sometimes reshuffles system shortcuts, so a combination that worked yesterday may now conflict.
Check System Settings → Keyboard → Keyboard Shortcuts for anything now using the same keys.

You can also click Maccy’s menu bar icon to open it without the shortcut, which helps you separate “hotkey problem” from “app problem.”

Fix 5: New copies aren’t being recorded

Two common culprits:

Ignore mode. Holding Option (⌥) while clicking Maccy’s menu bar icon toggles it to ignore new copies. It’s easy to trigger by accident, and it can look like the app broke. You can confirm with defaults read org.p0deje.Maccy ignoreEvents. A value of 1 means ignore mode is on.
Ignore rules. In Maccy → Settings → Ignore, check whether the app you’re copying from is listed. By default Maccy skips certain pasteboard types that apps mark confidential or temporary, which includes some password managers’ copies. That’s intentional.
Fix 6: Update or cleanly reinstall Maccy

Maccy 2.x requires macOS 14 Sonoma or newer, so a very old build may predate your new macOS. Update first.

Homebrew: brew upgrade –cask maccy
Direct download: grab the latest build from the project’s GitHub releases page.

If that doesn’t help, delete Maccy, reinstall it, and keep it in /Applications. Then repeat Fix 2.

Download carefully. Maccy’s README warns that lookalike sites distribute malware disguised as Maccy, and that maccy.app is the only official website. Don’t reinstall from a search ad or a similar-looking domain.

Why does this keep happening?

macOS stores Accessibility permissions per app identity. When a system update changes how that grant is evaluated, an app can end up listed as allowed while the underlying permission no longer validates. It’s a widely reported pattern across Mac utilities, not something specific to Maccy. Apple doesn’t document the exact mechanics , so treat the “why” as well-observed behavior, not a guarantee.

The practical takeaway: after a major macOS update, re-granting Accessibility to clipboard managers, window managers and automation tools is a reasonable routine check.

Still stuck? Report it usefully

If none of this works, open an issue on Maccy’s GitHub. The maintainers’ bug template asks for:

Your Maccy version (About window)
Your macOS version
The output of defaults read org.p0deje.Maccy

A report with those three items gets triaged faster. Note that some paste failures have been reported on recent macOS 26 releases as well, so mention your exact version.

The short version

Selecting an item pastes nothing? Check “Paste automatically,” then remove and re-add Maccy under Accessibility, then run the targeted tccutil reset. Everything else in this guide is about the less common cases. Maccy itself stores your clipboard history locally, so none of these fixes touch your data.

Did a particular macOS version trigger this for you? Tell us which one, so we can keep this guide current.