Ok first of im not really tech savvie but here it goes.
I have and Ipad 2 and I have used Calibe for a couple years now. When i updated to 8.3 i lost the ability to link Calibre and Marvin. After reading some of the newest posts i decided to try IOS 9. Good news is Calibre doesn't tell me my device is not compatible or whatever any more. Bad new is it still doesn't link to Marvin. I have uninstalled and reinstalled both ios and Marvin plug-ins with no luck. My cablibre is even up to date and im using Windows 7. So if someone else is having better luck with similar situation i would love to know how to fix it.