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• I am the host of a meeting but when I try to start the meeting I scheduled, I see the message: "Waiting for the host!"

• When I try to join a meeting using Internet Explorer, I receive an error message that states "Cannot continue. The application is improperly formatted."

• I recorded my Zoom meeting. Where do I find the recording?

• The video in my Zoom meeting recording is freezing on playback.

• I entered my email address and password to log in. I know it is correct, but I get an error and now my Zoom account is locked.

• Can I host concurrent Zoom meetings?

• There is an audio echo/feedback in my meeting.

• My audio is not working on my iOS or Android device.

• I'm connected to wifi and experiencing issues.

• I cannot start my Zoom meeting. When I click Start Meeting, Zoom never launches.

• I cannot launch my Zoom meeting in Blackboard using Firefox.

• Firefox is my default browser and Zoom will not launch.

• Zoom crashed during a meeting and disappeared, or Zoom is installed and won't launch.

• Some of my meeting attendees cannot join Breakout Rooms.

• I have an outdated version. I want to update, but I cannot sign into Zoom.

• How do I uninstall and reinstall Zoom on my device?

• More troubleshooting advice directly from Zoom

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We recommend using Chrome, Edge, or Safari instead of Firefox to play back Zoom meeting recordings. This is a known an issue with Firefox on Windows and the compatibility of Zoom's video recording format.  If you need to use Firefox, as a workaround, the meeting organizer can enable Optimize the recording for 3rd party video editor in their Zoom recording settings. This feature will not affect previous recordings but only new ones.
 

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To find the source of the audio feedback, the meeting host can mute all attendees.

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macOS Device:

1. Delete folder ~/Library/ApplicationSupport/zoom.us/data 

2. Delete file ~/Library/Preferences/zoom.us/ZoomChat.plist 

3. Terminate all cfprefsd processes. 4

4. In Terminal, input following command killall cfprefsd Then, please proceed with the steps below.

5. Open the Zoom desktop application.

6. Select zoom.us at the top of your screen and select Uninstall Zoom.

7. Select OK to confirm uninstalling the Zoom desktop application and all of its components. 

8. Reinstall your Zoom desktop client to the latest version. Download the latest version of the Zoom desktop client: https://zoom.us/support/download 

​Windows Device:

1. Download and run CleanZoom - you may use this link to download it: https://assets.zoom.us/docs/msi-templates/CleanZoom.zip 

   1. Note: Use of the clean uninstaller will completely remove the Zoom desktop client, as well as the Zoom plugin for Outlook. The Outlook add-in, Chrome/Firefox extensions, and Google Workspace add-on are unaffected.

2. Reinstall Zoom desktop client to the latest version from this link: https://zoom.us/support/download

The only way to resolve this when the meeting is already ongoing is to relaunch the meeting.  The host of the meeting can do these steps to avoid this issue:

If the host is a Mac user:

1. Terminate the Zoom app by clicking Quit Zoom.

2. After that, open the Finder on your Mac.

3. From Finder, click on Go on the top, and from there, do these:

   1. Delete folder:  ~/Library/ApplicationSupport/zoom.us/data

   2. Delete file: ~/Library/Preferences/zoom.us/ZoomChat.plist

   3. Terminate all cfprefsd processes. In Terminal, input the following command:  1 killall cfprefsd

4. Restart the Zoom app.

If the host is a Window user:

1. Download and run the CleanZoom application from this link: https://support.zoom.us/hc/en-us/article_attachments/360084068792/CleanZoom.zip.

2. Restart your computer when it's finished.

3. Once done restarting, please visit this link https://zoom.us/support/download. This will automatically download the newest version for you.

4. Re-install Zoom.

5. Restart the Zoom app.
   
   

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Follow these instructions to uninstall and then reinstall Zoom on your device with the latest version: Uninstalling and reinstalling the Zoom application – Zoom Support.

https://support.zoom.us/hc/en-us/sections/201740126-Troubleshooting-Zoom-Meetings