Hi, Petr,
For me, it works when the Webshield is turned off. All other shields are turned on.
I haven't checked, specifically, if it works with all other shields turned off, and the Filesystem shield on, but, since I've seemingly isolated it to the webshield (turning one shield off at a time), I would have to assume that it would work if the Filesystem shield were the only one turned on.
Thanks,
..rob