I’m not sure if this is a bug, but see if it happens to you. I have a customer who pointed this one out to me and I was able to reproduce it easily. Notes 7.0.2 client and 7.0 mail design.
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in mail, New Memo
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start typing a name and let autocomplete finish it
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click with the mouse in the subject field and type a subject
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now press Tab.
When I get to step 4, nothing happens, the Tab key is dead. If you alt+tab to another app and then return, all is good again. Strange.
Another thing, I could not choose Notes Client as my category when submitting this form.