Installed and ran the setup - all went smoothly but if I choose the zenpage template I get this error "Fatal error: Call to undefined function setthemedomain() in /home/merryle/public_html/themes/zenpage-default/index.php on line 1" and if I don't choose it but enable the plugin I get "Fatal error: Call to undefined function sortbymultilingual() in /home/merryle/public_html/zp-core/plugins/zenpage/zenpage-class.php on line 720
" I have re-uploaded everything- all my other templates work... suggestions?

check your versions. Zenphoto must be version 1.2.1 or better to support zenpage. If you are running nightly builds, you should be installing both the nightly for zenphoto and for zenpage.

Zenphoto says version 1.2 [2213] - is this new enough?

No. As above, it must be 1.2.1

Thanks so much - I upgraded and its all fine.. just seem to have lost my headers.. oh well!