Help Phone save corrupted pics

[Psygnosis]

Hi to all,
I have N1 with cyanogen nightly...
all goes fine...really untill today...
When I take a pic, it is saved like usually in the sd card and I can see it in the gallery app... I can see it also in the file manager...
all perfect...
But when I plug the usb cable and mount the sd card as mass storage, the last pic (and I mean just the last pic of today not the old pics I've taken) desappeared and all I find in the DCIM/Camera folder is a jpg file of 0bytes with the today date but wrong clock...
the pic is of course corrupted...
When I unplug the usb, the last pics disappeared...

Anyone have had this problem...please I don't want to restore anything untill the stable release of cyanogen is out...

thanks

Oh I've tryed to delete .thumbnail folder but nothing happend