Thank you for the swift response! We are using a Sony Fs7 and the MXF-codec . I should perhaps also clarify my question a bit: we have been filming for several days, each day has its own folder and timecode. Some of the days work perfectly fine while others does not (No audio-timecode found). We have used the same settings through the whole shooting and are puzzled about how random it lines up in the sync.
when Audio TC is not recognized by a Sony FS7 most of the time this is the reason: http://forum.tentaclesync.com/question/audio-timecode-3/
The reason for a black screen in Tentacle Sync Studio is not clear yet, does it also happen with only one FS7 file?