Aha: Does this give any idear of that's wrong? Unplugged Flirc while PC is turned on. Plugged Flirc back in again in another USB port, and now everything works again, like yesterday evening. Restart the PC and I get "button already exists." again, when trying to configure a remote. EDIT: And some hours later, after getting it to work by unplug/replug, it stops working again. this is annoying.