1.2 Index error at sign in

[Joint Systems]

Updated three shops to 1.2 and now getting an index error at sign in on all three.  The index displays fine when you open it but as soon as you click on sign in it loses its format.  

[toplakd]

You .css .js are blocked due to MIME type mismatch (X-Content-Type-Options: nosniff)

https://stackoverflow.com/questions/40728554/resource-blocked-due-to-mime-type-mismatch-x-content-type-options-nosniff

[Joint Systems]

Toplakd may have indeed been correct but  I fixed it by rewriting the .htaccess before having a chance to read his reply.  Thank you for responding!