Other PDF Issues

How to Fix Acrobat Pro Crashing When Adding Comments to Shared Reviews

Rana GarciaRana Garcia Nov 3, 2026 869 views

Question details

The user experiences sudden crashes in Acrobat Pro when trying to add sticky notes or comments to a Shared Review PDF document.

How to Fix Acrobat Pro Crashing When Adding Comments to Shared Reviews
Product
Adobe Acrobat Pro
Device & OS
Windows
Scenario
Adding comments or sticky notes to a Shared Review PDF.
Observed behavior
Acrobat Pro unexpectedly crashes or fails to display comments, even though the same Shared Review PDF works properly in Acrobat Reader.
Before you start

Ensure you have saved all open documents and confirmed your exact Acrobat Pro and Reader versions before beginning the troubleshooting process.

Solution 1Recommended

Clear the Collaboration Synchronizer Cache

Clearing corrupted synchronizer cache data and restarting the process is the most effective way to resolve Shared Review crashes.

The Adobe Collaboration Synchronizer runs in the background to handle Shared Reviews. Corrupted files within its local cache can cause Acrobat Pro to crash when interacting with sticky notes or comments.

1
Open Windows Task Manager

Press Ctrl + Shift + Esc to open the Task Manager and navigate to the Processes tab.

2
End the Synchronizer process

Locate 'Adobe Collaboration Synchronizer' in the list, right-click it, and select 'End task'.

3
Navigate to the Acrobat AppData folder

Open File Explorer and go to the directory path: C:\Users\<Username>\AppData\LocalLow\Adobe\Acrobat\DC\Acrobat (replace <Username> with your Windows username).

4
Delete the Synchronizer folder

Find the folder named 'Synchronizer', right-click it, and select 'Delete' to remove the cached data.

5
Restart Acrobat Pro

Open Adobe Acrobat Pro, load your Shared Review PDF, and try adding a comment again to verify the fix.

Clear the Collaboration Synchronizer Cache
Cache Cleared: Acrobat will automatically recreate a fresh Synchronizer folder the next time you open a Shared Review.
WPS PDF Solution

Add Comments and Annotate PDFs Safely with WPS Office

Avoid syncing conflicts and application crashes by using WPS PDF to quickly and reliably add comments, sticky notes, and annotations to your PDF documents.

  1. 1. Download and launch WPS Office: Install WPS Office for free and open the WPS PDF application.
  2. 2. Open your PDF document: Click 'Open' to load the PDF file you wish to review or annotate.
  3. 3. Access the Comment tools: Navigate to the 'Comment' tab located on the top ribbon.
  4. 4. Add a sticky note: Click the 'Note' icon and click anywhere on the document to insert your comment safely.
Lightweight and stable PDF editor designed to prevent unexpected crashesEasily add text comments, sticky notes, and highlightsFully compatible with all standard Adobe PDF formatsFree and intuitive user interface for seamless document review
microsoft office alternative - wps office

Frequently Asked Questions

Why does Acrobat crash only when I try to add comments to a Shared Review?

This specific crash is generally triggered by corrupted local cached data inside the Adobe Collaboration Synchronizer or interference from aggressive third-party security software blocking the background sync process.

Where can I find the Adobe Acrobat Synchronizer folder on Windows?

The synchronizer folder is typically located at C:\Users\<Username>\AppData\LocalLow\Adobe\Acrobat\DC\Acrobat. You will need to replace <Username> with your actual Windows account name.

How do I create a crash dump file for Adobe Acrobat DC?

Keep the crash prompt open, press Ctrl + Shift + Esc to open Windows Task Manager, go to the Processes tab, right-click the Adobe Acrobat DC process, and select 'Create dump file'. This file can be shared with Adobe Support for further analysis.