Mobile App: Channel Messages Disappear (Blank Channel Syndrome)

Jordyn Adrales

Updated June 11, 2026 15:15

Problem

Users may intermittently experience a channel appearing completely blank in the Mattermost mobile app — all past and present messages disappear as if the channel never had any content. The channel may self-resolve at a later time, typically when a new message is posted.

Root Cause

When a post is deleted in a channel, it can corrupt the local message chunk stored in the mobile app's local database (WatermelonDB). This causes the app to render the channel as empty, even though messages exist on the server. The issue affects both internal and external Mattermost deployments.

Symptoms

Users experiencing this issue will see:

A channel appears completely blank with no message history
The issue resolves on its own after a new message is posted in the channel
The problem may occur across multiple channels and recur intermittently
The issue is specific to the mobile app; messages remain visible on the web app

Solution

A code-level fix is actively in development that will prevent deleted posts from corrupting the local message cache. This eliminates the need for manual intervention. The fix will be accompanied by the Reset Cached Messages option in channel settings as a safety net for any unforeseen edge cases.

Temporary Workaround

If a channel goes blank on mobile:

Ask another user to post a new message in the affected channel — this often triggers the messages to reappear.
Alternatively, log out of the mobile app and log back in to force a data refresh.
A Reset Cached Messages option will be available in channel settings in an upcoming release as an in-app workaround.

Important: This issue can impact operations in time-sensitive environments. If you are experiencing this in a mission-critical context, logging out and back in is the most reliable immediate recovery method while the fix is being rolled out.

Related to

mobile