I see one change in CIQ. The "moment" (startOfDay) in activity tracking history is now a day off. My history for May 4th is now May 3rd, and the all the rest of history is also a day off. It's 6am local time on May 5th.
What else has changed as it relates to CIQ?
I saw a post in the vivoactive forum where the short from a the date is also odd for some of the CIQ watchfaces. https://forums.garmin.com/showthread.php?249702-Woke-up-this-AM-and-now-the-date-displays-as-Mar-05-May.
It also seems there are other problems with 2.80 - see the one about German here...
https://forums.garmin.com/showthread.php?249720-Let-s-discuss-firmware-2-80