For several years I could link and transcode AVCHD MTS files from a Sony DSC-HX9V foto camera, with no problems.
With files from the same camera and of the same type (Source Browser: MTS File / AVCHD MSP plugin / H.264 codec 1080i 50 / Dolby AC-3 256 k), shot this year, transcoding is no longer possible: Error messages like"exception, what : AVCHD reader : 8000ff" or "AVCHD AudioDecoder : 8aea0099" appear.
If I import files from former years again, there are no problems at all.