[Plugin: Password Protect WordPress] After pwd, requires clicking OK (return doesn't work)

This plug-in appears to work perfectly (thanks so much for it!) except that after I’ve finished typing the password, normal convention is to be able to hit return/enter, however, it doesn’t seem to work. I have to use the mouse to click OK. Bit of a pain…is there a way to mod it to allow return/enter to work?

(I’m on a Mac, latest OS, Safari/Chrome browser both tested)

https://www.ads-software.com/extend/plugins/password-protect-wordpress-blog/