Upgrading Drupal

HI
I have just finished upgrading site from 5.7 to 6.6 and alot of the menu items disappeared ,
usually the ones that where defined in the node itself - i mean that the user will add or update a node (story / page) and set the menu properties from there (not from admin -> build -> menu )

from my check in the new site , when loading the node for edit, the "menu parent" if set to a different parent than the one that used by the 5.5 site

I am upgrading a Drupal installation from 4.7.10 to 5.12.

I get the following error when trying to access any pages (including upgrade.php) when trying to upgrade installation:

Fatal error: Call to undefined function: system_region_list() in [site-directory]/themes/engines/phptemplate/phptemplate.engine on line 154

This method is defined in the system module. I have not disabled the system module and verified in the database that it is enabled.

Everything works fine if I switch back to the 4.7.10 codebase against the same database.

OK. I built a website using Drupal a while back, and thinking it was neato I used Postgresql for my database:

http://gamium.org

I slapped a template togeather, and we've been pretty much being a beta site for a while.

But we'd like to get serious about it, and are therefore moving from MediaTemple to another hosting service.

Since I'm going to be neck deep in the site anyway, I decided to upgrade.

Two bits:

1) Trying to move the data from one Postgresql database to another, using phpPgAdmin, never seems to work. All the scripts I export from phpPgAdmin can't even be run by phpPgAdmin! I need to know how to move the data from one database to another...

2) ...but I'd actually prefer to move to MySQL, as it's the database program I'm most familiar with, and if this sites going to stop being "that site we beta and play on" to "that site that's a serious project" I'll be the database administrator, and I'd prefer to admin a database I'm familiar with.

After cautiously trying to update our site up to the latest version 5 of Drupal, we ran into an error that we can't get pass.
It seemed to have happened when synchonizing files from the site to local using dreamweaver.

the error displayed is:

Fatal error: Call to undefined function: user_access() in ...html/modules/aggregator/aggregator.module on line 33

thanks in advance for any help!!

This is a warning I received after installing IMCE:

Hey, does anyone have any idea when Drupal 5.13 will be released? I don't want to upgrade to 5.12 only to find that 5.13 has been released the next day...