Hi Joe,
Create Another blank app and import salesforce connector and run the app if it runs successfully, then try to compare jars from this new app and old app.
it must be having issue of some duplicate jars or old jars.
Good luck!
What version of Mendix are you using? I see you have listed 9.24.3. The latest version of the SalesForce Connector (v7) needs 9.24.14. Could you try a blank project with the latest version of Mendix 9.24 and the latest version of the SalesForce Connector?
Good luck!