Have you used the batch tool? Sometimes there is corrupted data and the FW update does not get rid of this. I have my cards in just about every format and they all work. I have used the batch tool, as it wipes the internal memory of the DX90 or 50 completely and then when you do an install with the batch tool, you get a totally clean FW. The batch tool only works on PC's, and I use it on my mac with Windows 7 loaded.
Yes thanks, that was first thing that iBasso support sent me. In the end they asked me to return it, but sending it half way round the world wasn't worth it for an' inconvenience'. Loading loads of music back right now, hoping the fact DB folder correctly shows on card as well as internal memory means its solved. Too many people had this Start-Up problem, I counted six on this forum at different times so great if its not hardware related.