After the update I experienced that the custom workouts I loaded to the watch have diappered. When I access now "my training" I get the message that I need to download them from garmin connect.
I did so in the connect web portal and synced them again using Garmin Express (5.6.2 - i just updated) with a success notification. But still, the workouts are not there in the menu and I still get the message. I looked in the file system of the watch when connected by USB and I definitely see the .FIT files for the workouts there in the corresponding directory (GARMIN/WORKOUTS). But they are not displayed!!!!
Did you ever test that function in v6.0 before releasing it? It's basic without corner cases. It's incredible that you are able to break such basic things as the pure straight forward use case! Shame on you!