i have the same problem too, i can't save pictures and videos on N900 internal memory, i tryed deleting/formatting the internal memory, but nothing happens, same problem! If i put a SD on the device i can take pictures and videos, the internal memory works becouse if i reflash and if i don't keep on it the CSSU i can use all features with no any kind of error..

I need your help becouse i can't trash away 13 giga of optfs backup and my custom Rootfs and Optfs. soo sad :'''''''(