I have had the same problem with this error message” video management file is damaged, recovery is required to record/playback. I use the 16 GB Transcend class 6 SDHC cards. Now these class 6 cards are supposedly made to handle the HM-100 top data rate output… Makes me extremely paranoid during shooting…..really surprised JVC hasn’t responded to this issue yet.
If anyone has anymore insight on this issue….it would be greatly appreciated.