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So after some trials and tribulation, I simply closed out the tab and reloaded. Perhaps the CS50 staff caught the issue? At any rate update50 works now. If you had the same issue I did I recommend just closing the tab/browser and reopening cs50.io.
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Here's the pseudo code from the walkthrough:
psuedocode: "recopy" method
for each row
for n-1 times
write pixels, padding to outfile
send infile cursor back
write ...
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