What causes "Lightroom Classic Not Working After Update"?

Regression in a new release Catalog upgraded by the new version, so older versions can't open it Large preview folders being rebuilt after the update GPU driver incompatibility with the new version

How do I fix "Lightroom Classic Not Working After Update"?

1. Install the latest point release: Open the Creative Cloud app > Apps > Updates and install any x.x.1 fix (e.g. 15.4.1 fixed the Duplicates data-loss bug) Check Adobe's known-issues list for your version 2. Reset preferences: Back up your catalog Hold Shift+Option (Mac) or Shift+Alt (Windows) while launching Lightroom Classic and confirm resetting preferences 3. Fix very slow launches on big catalogs: Quit Lightroom and move the catalog's Previews.lrdata folder elsewhere Relaunch; previews rebuild as needed (one user's 20-30 minute launches went away) 4. Roll back to the previous version: Back up the catalog and keep the pre-upgrade copy Lightroom creates In the Creative Cloud app, click ... next to Lightroom Classic > Other versions and install the previous release Open the pre-upgrade catalog copy; a catalog upgraded by 15.4 can't be opened by 15.3

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Lightroom Classic Not Working After Update

Ongoing Mac, Windows Updated October 21, 2026

Quick answer

Several 2026 Classic releases shipped regressions (stuck exports in 15.3.1, a data-loss bug that got 15.4 pulled, silent import failures in 15.5). Update to the latest point release first; if the problem remains, back up the catalog and install the previous version from the Creative Cloud app.

Most likely fix: Install the latest point release.

Symptoms

After updating, exports hang, imports fail silently, Develop becomes much slower, Lightroom crashes or takes 20-30 minutes to launch.

Why it happens

Regression in a new release
Catalog upgraded by the new version, so older versions can't open it
Large preview folders being rebuilt after the update
GPU driver incompatibility with the new version

How to fix it

Try these in order — the most common fix is first.

1. Install the latest point release
1. Open the Creative Cloud app > Apps > Updates and install any x.x.1 fix (e.g. 15.4.1 fixed the Duplicates data-loss bug)
2. Check Adobe's known-issues list for your version
2. Reset preferences
1. Back up your catalog
2. Hold Shift+Option (Mac) or Shift+Alt (Windows) while launching Lightroom Classic and confirm resetting preferences
3. Fix very slow launches on big catalogs
1. Quit Lightroom and move the catalog's Previews.lrdata folder elsewhere
2. Relaunch; previews rebuild as needed (one user's 20-30 minute launches went away)
4. Roll back to the previous version
1. Back up the catalog and keep the pre-upgrade copy Lightroom creates
2. In the Creative Cloud app, click ... next to Lightroom Classic > Other versions and install the previous release
3. Open the pre-upgrade catalog copy; a catalog upgraded by 15.4 can't be opened by 15.3

This guide also covers

lightroom classic not working after update
lightroom update broke
lightroom classic 15 problems
roll back lightroom classic version

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