i was testing with clinton-hall a extra option in nzbToMedia,
first we thought it was a error in the the new option but it seems to be a fault in nzbdrone.
when a file doesn’t have a release group,
nzbdrone removed the filename completly
even when i got the rename option turned off in nzbdrone.
the topic on github can be found here including debug logs taken from nzbdrone, nzbget and nzbToMedia