First, I've restored to backup cause... yeah.
As soon as I upgraded to 1.4.1, I got a blank page on my gallery and had to manually go to /zp-core/setup.php
That rendered fine, showed no errors, so I ran the upgrade. My site came back BUT I was logged out and when I tried to log in, it blank-paged again.
I know that blank pages in PHP apps are USUALLY php errors. So I thought it may be my theme. I installed a BRAND NEW version at http://ipstenu.org/zentest/ - Clearly it doesn't work
My error log is filled with
"PHP Warning: Cannot modify header information - headers already sent " from all sorts of files.
FWIW, I can't download older versions from http://www.zenphoto.org/pages/older-versions-archive without ALSO getting gibberish
I tried a fresh download from http://zenphoto.googlecode.com/files/zenphoto-1.4.1.zip just to be doubly sure. Nada.
(See kids? THIS is why we make backups!)