Hi Matt
Hope you are doing well and sorry for the trouble. As described you are unable to fill in the PDF forms.
What happens when you try to fill the PDF forms? Do you get any error message? If yes please share the screen shot of the same for a better understanding.
As mentioned it started after you have added Lumin to Chrome and restarted the computer. For testing purposes, please try to turn off or remove the Lumin and restart the computer once and try filling the PDF forms and check.
Also make sure you have the latest version of the Adobe Acrobat DC you are using? Go to Help > Check for Updates
You may also try to turn off the protected mode for testing (Win Only) Go to Edit > Preferences > Enhanced Security > Uncheck 'Enable Protected mode at startup' Turn off the Protected mode and Uncheck 'Enhanced Security' > Click OK and reboot the computer once.
Note: Please turn on the security after testing to avoid any security risk.
Regards
Amal