On my business account I had updated to the latest CC version.
I was working in inDesign / Photoshop and noticed that since the update for my whole working day, creative cloud kept trying to sync fonts, saying it was complete (it did appear to be successful messages), then about 10minutes later it was resyncing the same qty of fonts again. This was happening all day. It was also trying to resync libraries over and over again.
I didnt have any issue with libraries but it did start messing with the document I was working on, resetting all the fonts to default. When I tried to re-link the fonts, the font I was loooking to choose was there but It would not allow me to confrim the selection.
I have noticed the new updates includes now syncing with fonts automatically by AdobeFonts and wondering is this to do with the issue? Im also not on the latest iOS the MAC im using is a mid-2012 so I cant update to the latest versions of Adobe Software (with the exception of inDesign that had an option to update up one version)