I have a problem with switching mode when Huawei E1550 (12d1:1446) dongle is connected through USB HUB. If I connect it directly everything is fine.
You can see attached usb_modeswitch log for both cases.

I've found this topic and think it is the same problem because he has USB HUB and maybe modem ...

I've met same problem today on my RaspberryPi with "Fedora remix release 18" installed.
libusb-devel package didn't work.
So I've found also libusbx package installed.
"Libusbx is a fork of the original libusb ... The libusbx fork was started by most of the libusb-1.0 developers, after the original ...