This is due to a plugin that is blocking necessary features to make our chat function. Software that blocks ads may also cause this issue. You must add our domains "cam.menchats.com" and "menchats.com" to your whitelist OR disable such plugins for the chat to function properly. These plugins may be listed as: uBlock, AdBlock, NoScript,Ghostery
Try using a private/incognito window to disable plugins. This works for most users.