Comment 30 for bug 1070873

I have discovered the cause for this.

You are using a proxy with an autoconfiguration URL (PAC script) which has got a syntax error in it (as far as WebKit is concerned)

When you run the add account it calls signon-ui and it segfaults because of this.

If you use konqueror you may also experience problems. In my case, it takes a very long time to load pages, like almost a minute long.

If you can, temporarily disable your proxy, or if you cannot connect without proxy, try manually setting the address of the proxy (not the PAC stript), for the duration of adding the account.

Once the account has been added, signon-ui isn't needed, and the proxy settings can be re-instated.