The cybook and Mac

[patatan]

I have a cybook and i am quite happy with it . It blocks from time to time but then I charge it, reset it and wait, and it always has worked again . I have a PC and IMac and used the PC with the cybook. But some weeks ago I used the Mac to add some books and delete others. I copied the .pcr files to the SD card of the Cybook. The Mac usually creates some files in the pen drives and memory cards that begin with a dot that you do not see in the Mac but can be seen in the PC if the options for the folder is to see hiden files. They usually do not cause problems but with the Cybook they did. The Cybook blocked very often and it took a lot to work again. Yesterday I deleted these files in the PC and it looks like it is back to its previous state.