Tuesday August 5, 2025

Summary

From around 10:00 AM to 7:52 PM PDT on August 5, 2025, some users were unable to change their vision-assisted themes in Slack. Affected users saw an error code like "REB6E19833F7" when they tried to make a change.

The issue was caused by a recent code change that introduced a new configuration check. When a user attempted to change a theme, the app would check a corrupt property and unexpectedly return an error. We identified and reverted the problematic code, restoring functionality for all affected users.

3:43 PM PST

Resolved

We have deployed a fix, which has successfully fixed the issue, and the incident is now resolved. If you were impacted by the issue, please conduct a force refresh to sync with the new version. Again, we’re sorry for any inconvenience this issue may have caused you. 

8:06 PM PST

Update

We are continuing to investigate the issue and are assessing several solutions to rectify the issue. We’ll provide an update once more information becomes available. 

6:41 PM PST

Investigating

We are currently investigating an issue whereby some users are receiving error messages when trying to change their appearance preferences in Slack. We’ll provide an update in 30 minutes or sooner, once more information becomes available, and we’re sorry for any inconvenience this may be causing you. 

6:16 PM PST