It's gone!
I had this problem once before, and it's back and I can't remember for the life of me how to fix it again! The answer was posted in the Autodesk Discussion forum, but their server is down right now.
Could someone help? It happens when I simply change the arrow type for a leader line. Then when I go to change it back to closed filled arrow, it stays on the previous arrow type. I can change to anything else BUT a closed filled.
Why does it do this in the first place?