webcam works only once per boot

[Buganini]

My webcam worked fine before,
but after I make delete-old delete-old-libs and portmaster -f net-im/skype,
my webcam works only once in every boot cycle,
than it hang with backtrace:
#0  0x000000080186b4bc in clock_gettime () from /lib/libc.so.7
#1  0x0000000000500f0e in ?? ()
#2  0x0000000000501372 in ?? ()
#3  0x00000000004ffa5b in ?? ()
#4  0x00000000005ca59a in fls ()
#5  0x0000000800f2b81a in libusb20_tr_callback_wrapper () from
/usr/lib/libusb.so.3
#6  0x0000000800f2ab27 in libusb_get_active_config_descriptor () from
/usr/lib/libusb.so.3
#7  0x00000000005ca7ce in fls ()
#8  0x000000080133e93d in pthread_create () from /lib/libthr.so.3
#9  0x0000000000000000 in ?? ()

How can I fix it?

Thanks,
Buganini