Internet sharing - stopped working, can't turn off

I am confused - I have set up Internet Sharing from my iMac. It has worked without a problem, having my iBook sharing the iMac's Internet connection through a SpeedTouch USB modem via Airport, but the other day it wouldn't work any more; using the diagnostics on the iBook shows all green, but no pages will open in neither Safari nor Firefox.
The connection works fine on the iMac, though.
But then I thought I'd better turn off the sharing since it doesn't work, but opening the Sharing panel in Sys Prefs shows me that everything is dimmed; the modem in the drop down list, as well as Airport Options. I have to stop sharing to make changes, but when I click the Stop-button, nothing happens! I have stopped Web Sharing, but no go.
In short; I am stuck. Anyone got a solution? At least as to how to turn it off?

No, and as far as I have understood, repairing permissions doesn't solve as much as we hoped for once:)
But again, as it often is with my mysterious problems, it has been solved. Probably just because I disconnected the USB-modem (a kind of modem I find strange and I think I prefer modems with an Ethernet interface, but that is what my ISP gave me...) and then I was able to stop the sharing.
I also had to restart the computer after an installation and that might have fixed whatever it was, because when I started the sharing again, it worked on the iBook...
But if you asked me what happened, I cannot tell you. The only thing I know, is that when you have an ADSL (DSL)-connection through a USB-modem, one needs to disconnect to do certain things...
Oh well. As long as it works...

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My iMac 27 (10.7) with Internet Sharing enabled has been working perfectly since last year. After upgrading to 10.8, I noticed the up arrow flashes and goes to regular WiFi mode. Stopping/starting the service causes the up arrow to flash again and immediately default to WiFi. I removed Ethernet and WiFi options from Network settings and re-installed which solved the Internet sharing from flashing and defaulting to WiFi mode. However, connecting to the Internet sharing from other devices (iphone/ipad) does not work and will not connect to the internet. On the iMac, I'm able to browse the Internet without issues.
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Thanks for your answer.
Unfortunately this isn't a solution for my problem. As I understood, you showed me that your IP addresses had changed after enabling/disabling internet sharing. I checked my IP addresses after enabling/disabling internet sharing by using "ifconfig" but they are the same as set manually before.
My other strange observation regarding the ping command has gone now. After switching on internet sharing I had to disconnect the ethernet cable and plug it in again. Then the ping between both computers is working (but still not internet sharing).
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