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Jeff Garbers - PRODJeff Garbers - PROD 

Resolving "Cannot create an AuthInfo instance that will overwrite existing auth data" error

Most of the sfdx commands that I use are suddenly giving the above error. I've tried deleting my ~/.sfdx directory and rebuilding aliases from scratch, as well as re-authenticating to my DevHub, but that's no help, nor does changing log level options provide any additional data. The error code is AuthInfoOverwriteError and the stack from sfdx.log is
 
at Function.create (/Users/jeffgarbers/.local/share/sfdx/plugins/node_modules/@salesforce/core/lib/sfdxError.js:141:16)
at AuthInfo.init (/Users/jeffgarbers/.local/share/sfdx/plugins/node_modules/@salesforce/core/lib/authInfo.js:432:45)

sfdx --version gives sfdx-cli/6.56.0-e3fd846a1f (darwin-x64) node-v8.15.1

I'd appreciate any suggestions as to how to get past this error, as I'm pretty much dead in the water with most sfdx commands failing. Thanks!