Caldav not working with Lion but not with Mountain Lion :-(((((

Why Apple is not able to adapt the Caldav protocol again so it goes back to the way in Lion. It is claiming to have an outrage in support, that no problems are known even though the network is fully in the messages.

Hello mrtessitor,
I'm sorry to hear you are having these issues with your iMac after a recent update to Yosemite; I know how frustrating that can be. If you are having issues with one of your external displays that was working previously, you may find the information and troubleshooting steps outlined in the following articles helpful:
OS X Yosemite: Connect multiple displays to your Mac
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Sincerely,
- Brenden

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