I just had a similar issue. When connected to CarPlay, if I select "CarPlay" to get to my apps, it just shows the CarPlay icon, but never gets to the home screen where all the apps were. I noticed something was up before then because when I would get a call, the caller ID wasn't showing up on my screen. Rebooted iDrive and everything is working fine now.
edit: to reboot iDrive, hold down the volume/on/off knob for 30+ seconds until the system shuts down.
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