Yup. Came into work this morning and after reading your post checked the clients on both my work machines. They had stopped running with several sets of data to be upload.
Stopping and restarting the clients eventually cleared up the backlog but I lost a bunch of units on one of the machines. They aren't being recognized as uploadable for some reason.
Phooey. This means the dualie at home probably stopped and is doing nothing right now. I gotta add that -df option. I've been meaning to but keep forgetting (smacks me noggin).