I updated old 1.1.6 to "all new" 1.2.0 and lost all comments. Had to downgrade back to 1.1.6 (happily I've got backups) and restore MySQL. Did I do something wrong or is it just what I get...

Followed these instructions: http://www.zenphoto.org/2008/08/installation-and-upgrading/ (section Upgrading)

Is it possible that you forgot the prefix for the db table in the mysql settings? THat would cause the new installation to create new tables that of course miss then your comments. Maybe you could take a look via PhpMyadmin?

That helped. New zp-config example file had prefix by default...

Well headed more problems...(even before updating...)
"Lupa evätty" means "denied" or similar

`
Warning: copy(/home/.../public_html/galleria/albums/multimediaDefault.png) [function.copy]: failed to open stream: Lupa evätty in /home/.../public_html/galleria/zp-core/controller.php on line 16

Warning: copy(/home/.../public_html/galleria/albums/zen-logo.jpg) [function.copy]: failed to open stream: Lupa evätty in /home/.../public_html/galleria/zp-core/controller.php on line 17

Warning: Cannot modify header information - headers already sent by (output started at /home/.../public_html/galleria/zp-core/controller.php:16) in /home/.../public_html/galleria/index.php on line 20

Warning: Cannot modify header information - headers already sent by (output started at /home/.../public_html/galleria/zp-core/controller.php:16) in /home/.../public_html/galleria/zp-core/functions.php on line 1897

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/.../public_html/galleria/zp-core/controller.php:16) in /home/.../public_html/galleria/zp-core/admin-functions.php on line 6

Warning: Cannot modify header information - headers already sent by (output started at /home/.../public_html/galleria/zp-core/controller.php:16) in /home/.../public_html/galleria/index.php on line 76
`

Sorry for my last fast wining...

Problem solved by these those commands

[~/public_html/galleria/albums]# chmod 777 multimediaDefault.png
[~/public_html/galleria/albums]# chmod 777 zen-logo.jpg