All of a sudden courses have stopped uploading from Garmin Connect to my Edge 530, they don't even show up on the edge if I hit the send to device button in connect, the photo and screen shot below show what's on the device and what's in Connect

All of a sudden courses have stopped uploading from Garmin Connect to my Edge 530, they don't even show up on the edge if I hit the send to device button in connect, the photo and screen shot below show what's on the device and what's in Connect

or directly from the Edge file system by deleting files from the Garmin\Courses folder.
This is the course (no pun intended), I took in the end, now got about 25 spare slots