With 1.1 installed:
Selecting "Check for updates" from the button menu in the Add-ons Manager shows "Updating add-ons", and a few seconds later shows "No updates found".
With 1.3 installed (and no other changes):
It remains showing "Updating add-ons" forever, and never completes.
I've switched between 1.1 and 1.3 several times to check, and can reliably reproduce it. It always works with 1.1 installed but fails to complete with 1.3.
With 1.1 installed:
Selecting "Check for updates" from the button menu in the Add-ons Manager shows "Updating add-ons", and a few seconds later shows "No updates found".
With 1.3 installed (and no other changes):
It remains showing "Updating add-ons" forever, and never completes.
I've switched between 1.1 and 1.3 several times to check, and can reliably reproduce it. It always works with 1.1 installed but fails to complete with 1.3.