Meeting Manager Displays a Not Responding Message or Crashes after Joining into a Webex Session

Meeting Manager displays a not responding message or crashes after joining into a Webex session.

Error: 'the atmgr module has stopped responding' and the Microsoft Send Error Report window appears after joining a meeting.

Error: 'ATMGR module has stopped working.' after joining a session.

The Webex client has encountered an error and needs to close.

System crashes or locks up (freezes) or reboots or browser crashes when attempting to start a meeting.


This issue may be caused for the following reasons:

  • The Webex video component conflicts with the video card or camera installed on the computer.
  • A corrupted meeting software installation.
  • A TV tuner or video capture device may be installed on the computer.


To troubleshoot the issue:

Attempt to start or join the meeting after performing each step.

  1. If you are a host, schedule a new meeting, go into the Show advanced options, under Meeting Options select Edit meeting options, then uncheck the box for Video. Click OK, then start the meeting.
    • Note: If you are a meeting attendee, contact technical support for assistance in diagnosing this issue.
  2. Disable the Aero theme on the computer (Win 7):
    1. Right-click on the Desktop, then choose Personalize.
    2. Scroll down to the Basic and High Contrast Themes and choose Windows 7 Basic.
  3. Perform an uninstall/reinstall of the Meeting software, see:

If you were able to join the meeting after performing step 2, contact your IT department or system vendor for assistance updating your video card/video capture device drivers.

Contact technical support if you need assistance performing the steps in this article.


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