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Ok. I got the rotate options to come back with the following steps.
I was in 3x landscape extended desktop, and couldn't change rotation.
I created a 3x1 group.
I then disabled the group.
Then I re-extended the desktop to the other two monitors.
And the rotate options were available again.
Not sure if this is the reason but, previously, I wasn't switching out of eyefinity by explicitly disabling the monitor group - but by switching to an extended desktop profile that I had saved. Maybe this caused the rotate option to be stuck "off"?