After installing IE 7 using all defaults on a relatively clean Ubuntu 12.04 system, every time I started Internet Explorer it gave me a save file dialog and then closed. I tried the RunOnceHasShown/RunOnceComplete tip (using both string & dword keys) but no luck. After searching support tickets, I found the following command in ticket 889054 which fixed it for me:
echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope
To make this persistent across reboots, you'll need to change /etc/sysctl.d/10-ptrace.conf to match this line:
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