Thanks Stephen, it worked!
Now, a new error comes up by clicking the SEARCH key up in the search form:
Fatal error: Call to a member function getFolder() on a non-object in /my/server/path/photo/zp-core/template-functions.php on line 3713
line 3713 is:
`echo $prev."<a $class href=\"http://".$host.WEBPATH."/rss.php?albumtitle=".urlencode(getAlbumTitle())."&albumname=".urlencode($_zp_current_album->getFolder())."&lang=".$lang."\" rel=\"nofollow\">".$linktext."$icon</a>".$next;`
but if I make it
`echo $prev."<a $class href=\"http://".$host.WEBPATH."/rss.php?albumtitle=".urlencode(getAlbumTitle())."&albumname=".urlencode(getAlbumTitle())."&lang=".$lang."\" rel=\"nofollow\">".$linktext."$icon</a>".$next;`
the error disappears!! Very messy this upgrade to 1.2.3 :-(((
Awaiting your wise comments...