Hi all,
I have been made aware of a bug when changing the background color of a calendar, the color change soon reverts back to the previous value (or soemthing completely different). This only appears to happen on 'some' calendars, the most obvious being calendars called 'Work'. It appears Apple want's us all to have purple Work calendars. Purple is a lovely color which is why I use it on my Family calendar, I dont want a purple Work calendar.
My understanding is that Apple is working on the problem. It appears to be iOS7 and/or iCloud specific, but I have heard of issues with Exchange calendar being affected as well.
I'll update here when I know more.
Regards
John