Thanks so much Danny,
Your link did the trick.
For the record, here's exactly what I did.
Inside here, the webwork/ directory was not readable to me. Hence:
sudo chmod 775 webwork/
sudo myisamchk -r -q MAT258-Bradley_key.MYI
Also, this link has instructions for backing up the database:
I followed the directions before doing the above, but I got
an error because of the corrupted table I was hoping to fix.
So in the end I just fixed the problem as above without backing anything up. Luckily it all works fine now.
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