vloopback error

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Hi I've been using vloopback from
http://motion.technolust.cx/vloopback/index.html
as well as the http://www.tibit.org/video/vloopback-0.90-tibit.tar.gz hack which fixes the dev_offset error. I've been using it for awhile across a bunch of distros from RH 7.3 to Mandrake 9.1 but now I'm getting a sementation Fault on anything I try to use it with. I have 2 AverMedia bt768 working with xatwv etc.
dmesg show the following error. Any Ideas? This example using effectv



vloopback.c: Video4linux loopback driver v0.90-tibit1
vloopback.c: Loopback 0 registered, input: video2, output: video3
vloopback.c: Loopback 1 registered, input: video4, output: video5
vloopback.c: Loopback 2 registered, input: video6, output: video7
bttv0: PLL: switching off
Unable to handle kernel NULL pointer dereference at virtual address 00000004
printing eip:
c011933b
*pde = 00000000
Oops: 0002
CPU:    0
EIP:    0010:[<c011933b>]    Tainted: P
EFLAGS: 00010082
eax: e83b5c68   ebx: 00000282   ecx: dcb57dac   edx: 00000000
esi: 803c7601   edi: 0000003c   ebp: dcb57db8   esp: dcb57da4
ds: 0018   es: 0018   ss: 0018
Process oldeffectv (pid: 2852, stackpage=dcb57000)
Stack: 00000000 dcb56000 00000000 dd624000 08069124 00000000 f499ebd8 00000afd 0000001d 00000001 08069160 00000400 c017afd4 effee4a0 00000001 00000000 c01bf370 dcb57dfc 00000212 c0123316 00000212 c0291788 dcb57e0c c0123f6d Call Trace: [<f499ebd8>] [<c017afd4>] [<c01bf370>] [<c0123316>] [<c0123f6d>] [<c01236ed>] [<c01202e2>] [<c01201d4>] [<c012000a>] [<c010a416>] [<c012de8b>] [<c012df5c>] [<c012a223>] [<c012a3d7>] [<c0118551>] [<c013a964>] [<c0139389>]
 [<f49d13a8>] [<c014782d>] [<c0108fe3>]

Code: 89 4a 04 89 45 f8 e8 da fa ff ff fa 8b 55 f8 8b 45 f4 89 02

[root@localhost root]# oldeffectv -device /dev/video3 -size 480x352
v4lopen: failed to open /dev/video3: Device or resource busy
Video initialization failed.
[root@localhost root]#

Thanks in advance
Daniel Jircik
http://home.swbell.net





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