Gallery won't work with PHP 4.03

PHP 4.03 introduced a bug in the serialization code that causes Gallery's database files to be corrupted. :-( They fixed that bug in 4.04, but in the development versions of 4.04 they introduced a new bug that causes you to be unable to upload zip files! AIEEE!There are open bugs against both of these problems filed in the PHP bug tracker so it's possible that future releases of PHP will fix this. In the meantime I recommend that you stick to PHP 4.02.