Sure you can get answers to your questions, but yo have not asked for this things in your last posting, so I'm sorry for this lack of informations:
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Are you encrypting data in memory, or is it plaintext?
The datas are encrypted in memory, too.
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Do you clear the clipboard after sensitive data is copied to it?
Yes, there is an option where users can select how long the datas stay in clipboard. After that time the datas are removed from the clipboard
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When the master password is changed, is all data re-encrypted, or is the header merely changed to reflect the new hash?
All datas are reencrypted after the change of your master keyword.