I restarted in safe mode. I am able to access the Internet without script errors but still unable to save or copy files.
I attempted to run KeyChain First Aid:
Repair started
Checking keychain configuration for andrewmiller (user ID=501)
Home directory is /Users/andrewmiller
Checked login keychain
Unable to open ~/Library/Keychains/login.keychain (-25312)
Failed to rename /Users/andrewmiller/Library/Keychains/login.keychain to /Users/andrewmiller/Library/Keychains/login_renamed.keychain, reason: The operation couldn’t be completed. Invalid argument
User differs on ~/Library/Preferences/com.apple.security.plist, should be 501, owner is 0
Owner not corrected on ~/Library/Preferences/com.apple.security.plist, reason: The operation couldn’t be completed. Invalid argument
Checked default keychain
User differs on ~/Library/Preferences/com.apple.security.plist, should be 501, owner is 0
Owner not corrected on ~/Library/Preferences/com.apple.security.plist, reason: The operation couldn’t be completed. Invalid argument
Checked contents of ~/Library/Keychains/login.keychain
Unable to open ~/Library/Keychains/login.keychain (-25312)
Checked contents of ~/Library/Keychains/Microsoft_Intermediate_Certificates
Unable to open ~/Library/Keychains/Microsoft_Intermediate_Certificates (-25312)
Warning: some problems were not fixed
Repair failed
The error message when attempting to log out as the user:
Unapproved caller. SecurityAgent may only be invoked by Apple software.
