@kido.resuri: Wheee, a year late, but, hey, here goes:
Check the log file (/usr/local/kfmon/kfmon.log), my guess is something simple is preventing the inotify watches from being setup. That, or you're hitting a busy database and my crappy timing workarounds don't fit your setup.
Both of those issues should be detailed in the logs, though
.
Also, I just pushed updated binaries that include the roughly year-old fix (oops.) for not being basically completely useless if the device ever had the misfortune of being mounted on an OS X box.
And also some possibly broken changes for the whole KOReader/Nickel thingy.