Yeah i did, it was able to add working devices afterwards, but what i'm getting at is it happens regularly and on 2 different computers. Was hoping there was a "fix" that wouldn't require entering 40+ Machines each time.
N8tureboy, next time this happens, please PM us the config file for the miner. We're looking for an corruption of data.
Or, compare a working config with a broken config and let us know what's different?