I can sync with DropBox without any problems from my MacBook Air (and from iPad Air and iPhone). But when I go to the Mac mini to sync, I'm getting a consistent hang. Opening the Force Quit window shows that Accordance is not responding. I do most of my Accordance stuff on the MBA.
I've rebooted the mini and it doesn't help. I moved all the pertinent data to the mini via AirDrop and then tried to sync the mini again. Hang —> Force Quit. Everything else seems to be working great on both machines. I have also repaired permissions on the mini.
MacBook Air = Mid-2013 1.7GHz i7
500 GB, 168 GB free
Mac mini = 2.3 GHz i7
16 GB RAM
1.1 TB Fusion Drive, 398 free