Using trunk 3394, I encountered the FsIoNotify assert while attempting to browse the directory tree in chdkptp GUI on D10
ASSERT!! FsIoNotify.c Line 451
Occured Time 2014:03:29 16:05:07
Task ID: 12714009
Task name: PhySw
SP: 0x00309934
Haven't looked in detail but I would guess it involves the directory listing functions. The file browser also uses stat, but IIRC that was safe.