This is usually a browser cache issue. To clear your browser’s cached data, please follow these steps - note that they apply to Google Chrome, the suggested browser for Proof.
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These steps will clear your browser data and may remove any passwords you have saved in Chrome:
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1) Click on the 3 dots in the upper-right corner of your Chrome window and select
“Clear Browsing Data” from the dropdown menu.

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2) In the next screen, click “Advanced” and select the checkboxes you wish to delete.

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3) Close and relaunch Chrome, then try your action in Proof again.