hostmode doesn't work for me,

when I try to connect a usb mouse or flash drive sometimes nothing happens and sometimes it says:
"can't mount filesystem" (or something like that, it's translated)

dmesg shows:
... new full speed USB device using musb_hdrc ...

and after that a couple of lines like these:
usb 1-1: khubd timed out on ep0out len=0/0
usb 1-1: khubd timed out on ep0out len=0/64

I've tried different speeds, does anybody know what's wrong here?

Thanks in advance,
AhBarnasha