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Did you try the Expedition System Restore?
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It seems like running the system restore worked. I deleted display states, registry settings and registry keys. Now the optimizer runs without Expedition shutting down.
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Thanks. Most people just need the display states option.
I should have asked someone to save their settings to see if I could replicate it.
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Thanks to Kite who sent his display states, I found the problem. It was in the ribbon, which is why deleting the display states fixed it for most people.
However, given that I don't know why/how it can break in the display states (the ribbon is a third party product), I have posted an update that traps this particular error.
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Many thanks for all your help with this Nick. Everything works perfectly now.