Hey Zach,
I don't see any system-wide increases in 401 volume, so perhaps it is either a user authorization or signature issue? Please double check that your key and secret in code are the same as on
https://www.tumblr.com/oauth/apps as well.
Regarding the API Console, it should now be working, so you may want to try logging in with it again as well.
After looking into these other things, let me know if you have any specific requests that seem like they should be working but are still not, and I can check into them some more.
Regards,
Mike