Foton GUI quietly discarded (some of?) notch filter definitions and replaced them with a flat gain of 1.
This is easily reproduced by first opening e.g. /opt/rtcds/lho/h2/chans/filter_archive/h2iscey/H2ISCEY_120828_143926.txt and saving it to some other file, e.g. test.txt, and take a diff (attached).
Probably because of this bug, all WFS notches are gone from current H2ISCEY filter file.
This is extremely worrisome.
It's not notches, it's zero ramp time.
bugzilla report of this:
https://bugzilla.ligo-wa.caltech.edu/bugzilla/show_bug.cgi?id=414
Jim Batch already found the cause of this (ramp time was zero for the filter), and is working on a future workaround. In the mean time, if you select "ramp" switching, don't forget to set the ramp time manually to something non-zero.