Sorry but not sure what this means?
My Mailwasher Pro login has also failed this morning after many months of working ok.
Are you referring to MWPro itself not logging into any site? or just your gmail login within MWPro?
If gmail, yes, if you change your gmail password, you will need to create a new app password as the old ones wont work.. (sometimes also google block an app password for no apparent reason) this from google:
To help protect your account, we revoke your App Passwords when you change your Google Account password. To continue to use an app with your Google Account, create a new App Password.
Tip: If the app offers "Sign in with Google," we recommend you use that feature to connect the app to your Google Account.
Directions for this here;
https://support.google.com/accounts/ans ... -passwords
Setup the new app password and enter that into MWPro and you should be all set....?
NOTE:
If you cannot find the option for an app password, AFTER logging into gmail, try going directly here:
https://myaccount.google.com/apppasswords