Should I update?

Should I update Lightroom Classic?

Lightroom Classic 15.5 · Known bug

Lens blur causes blue line artifacts in develop and export

Not marked fixed as of Lightroom Classic 16.0.0. The bug was reported for Lightroom Classic 15.5. Adobe tracks it (status: Investigating). It happens on macOS only. There is a workaround.

Status
Not fixedAdobe: Investigating
Severity
Major
Affects
Specific feature
System
macOS only

Workaround

Turn off Lens Blur, run Update AI Settings, and leave Lens Blur disabled.

Timeline

  1. Aug 24, 2026Reported on Lightroom Classic 15.5
  2. Nov 10, 2026Not marked fixed as of Lightroom Classic 16.0.0Adobe: Investigating

The report

0 votes · 7 replies

Reported on macOS by 3 people (from the report and 7 replies).

“P: Blue horizontal artifacts appear after applying Lens Blur on Mac mini M4 – Lightroom Classic 15.5 / macOS Tahoe 26.5.2”

Read it on the Adobe Community board
Should you update Lightroom Classic today?Today’s verdict for Windows and macOS, and every known issue behind it.

Based on public bug reports on the Adobe Community board. Last changed November 10, 2026. The title and rating are ours; the report is the reporter’s. Not affiliated with Adobe.