Upgrading Drupal

Hi.

I have a private forum and I would like that when a user writes a comment on this forum, workflow module automatically send a mail to all users with permission on this forum.

A private forum for me is a forum that has permission only for one specific role. This role is assigned to some users so they can access to the forum and make comments, and users without that role can't access to the forum.

I have defined a rule in workflow module like this:

Upgrading from 6.1? to 6.16 worked fine. No error messages. Site seemed to work, but the administration pages where all blank. No error messages, no nothing.
Switching to php 5.2.9 solved the problem. Just to be sure I switched back to 4.4.9 and the problem came back.

I installed 6.15 yesterday and it was working fine. I upgraded to 6.16 tonight and it appeared to upgrade correctly (no errors); however, when I clicked the link to go to the "site maintenace" page to put the site back online, I get the below error:

Fatal error: Call to undefined function: array_intersect_key() in /homepages/4/d233466065/htdocs/modules/update/update.compare.inc on line 695

I have used the old database... now I have these annoying messages ... please database experts how do I solve the following ? I think they are mostly related issues

* user warning: Unknown column 'a.label' in 'field list' query: SELECT a.aid, a.name, a.label AS default_label, a.ordering AS default_ordering, a.required AS default_required, a.display AS default_display, a.description, pa.label, pa.default_option, pa.required, pa.ordering, pa.display FROM uc_attributes AS a LEFT JOIN uc_product_attributes AS pa ON a.aid = pa.aid AND pa.nid = 5 WHERE a.aid = 2 in /home/malebod1/public_html/earthsmate.com/modules/ubercart/uc_attribute/uc_attribute.module on line 555.
* user warning: Table 'malebod1_earthsmate.cache_uc_price' doesn't exist query: SELECT data, created, headers, expire, serialized FROM cache_uc_price WHERE cid = 'efb52172963fc88444fc12d20f577002' in /home/malebod1/public_html/earthsmate.com/includes/cache.inc on line 26.

I upgraded from 16.15 to 16.16 and now I getting 500 internal server errors when I try to access content. I get to the home page which shows nodes but when I try to access the nodes or any other page such as the admin page I get a white 500 internal server error page.

Hey. I've just upgraded to 6.16 and now find that if I enable the color module, all the display and CSS on my pages seem to go crazy. It's taken me ages to work out it was the color module that was responsible! I'm using Garland. Can anyone help?

Also (stupid question I'm sure), is it ok to put 6.15 files back into a 6.16 version? Not that trying the 6.15 color module helped...

K