I've been having difficulty getting MFS to work consistently. I am able to open and read files that I know exist on the SD card, but if I try to iterate a directory, it sometimes locks up or crashes on the call to _io_mfs_dir_read. Sometimes reformatting the file system on the SD card seems to help, but usually not. The call to _io_mfs_dir_open seems to work fine, and like I said I can open and read files via fopen... so the file system layer itself seems to be up. Has anyone else encountered anything like this? Any suggestions on how to dig into this?