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.
  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.

If you need assistance performing the steps in this article, contact technical support. For help, see: WBX162 - How Do I Contact Webex Customer Services or Technical Support?


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