I enable a certain addon and it takes a few seconds to enable it.
If however I then go to the list addons page, the addon is shown as disabled. If I tick the box there and go back to my admin.php page it shows as unticked.
I assume it's something related to the addon taking a little time to enable. I've tried leaving it for a minute or two but that doesn't seem to help.
The checkboxes seem to have come unsynced on the two separate pages...