Problems after compiling new kernel

[Charles Trois]

Hello!

(I had posted this to the newbie list, but this is probably a more proper
place)

In my YDL 3.0, I compiled a kernel with a new .config and installed it.
It boots more or less normally, except that the logs show the following
errors.

(1)

usbdevfs: USBDEVFS_CONTROL failed dev 3 rqt 128 rq 6 len 18 ret -110

What does it mean? Is it important? May I neglect it?

(2)

Sep 13 13:39:33 sirrah iptables: Can't locate module ip_tables
Sep 13 13:39:33 sirrah iptables: iptables v1.2.6a: can't initialize iptables
table `filter': iptables who? (do you need to insmod?)
Sep 13 13:39:38 sirrah autofs: automount startup succeeded
Sep 13 13:39:33 sirrah iptables: Perhaps iptables or your kernel needs to be
upgraded. 
Sep 13 13:39:33 sirrah iptables:  failed

What is that? What would produce a module ip_tables? iptables-1.2.6a-2 and
iptables-ipv6-1.2.6a-2 are installed.

(3)

Sep 13 12:35:46 sirrah sysctl: error: 'dev.mac_hid.mouse_button_emulation'
is an unknown key
Sep 13 12:35:46 sirrah mouse-emulation: Enabling mouse button emulation:
failed
Sep 13 12:35:46 sirrah sysctl: error: 'dev.mac_hid.mouse_button2_keycode' is
an unknown key
Sep 13 12:35:46 sirrah mouse-emulation: Configuring mouse emulation button
2:  failed
Sep 13 12:35:46 sirrah sysctl: error: 'dev.mac_hid.mouse_button3_keycode' is
an unknown key
Sep 13 12:35:46 sirrah mouse-emulation: Configuring mouse emulation button
3:  failed

This is really annoying: I have lost the button emulation.
On the YDL site, there are two Howto's (enable button emulation), but they
do not seem to apply here: they refer to a file /etc/sysconfig/mouse,
whereas there are in fact two files, /etc/sysconfig/mouse and
/etc/sysconfig/mouse-emulation. Both seem to be in order. Then what is there
to do? 
An attempt to run
/sbin/sysctl -w dev.mac_hid.mouse_button2_keycode=68
produces the reply
'dev.mac_hid.mouse_button2_keycode' is an unknown key.

I suppose that the trouble comes from the new kernel, but I can't find an
entry in the .config file that could possibly cause it.

All suggestions on these problems will be gratefully received.

Charles