Upgrading Drupal

After upgrading from 4.5.2 to 4.6 on a test site I started getting errors like the following:

Notice: unserialize(): Error at offset 2 of 954 bytes in c:\programmi\easyphp1-8\www\versus\includes\bootstrap.inc on line 130

warning: Cannot modify header information - headers already sent by (output started at c:\programmi\easyphp1-8\www\versus\includes\bootstrap.inc:130) in c:\programmi\easyphp1-8\www\versus\includes\common.inc on line 99.

I've upgraded on a test site my site with the following modules:
article
taxonomy_access
taxonomy_otf
dba

After an apparently succesful upgrade the article module is unusable and trying to create a new content give me these errors:

user error: The table 'sql56203_2.vocabulary_node_types' doesn't exist
query: SELECT v.*, n.type FROM vocabulary v INNER JOIN vocabulary_node_types n ON v.vid = n.vid WHERE n.type = 'story' ORDER BY v.weight, v.name in c:\programmi\easyphp1-8\www\versus\includes\database.mysql.inc on line 66.

I upgraded my site from 4.52 to 4.6, but I found that the tracker module only shows the first page. The same problem was with upgrade 4.5 to 4.52 as reported by other posts.

I would be most grateful if some one could help to highlight the solution to this problem.

Thank you
XBChen

I had my site running on 4.5 on a separate machine.
Based on the success of that my dept decided to get a dedicated machine for me to install 4.6 and use it for the dev community here.

So i installed multple site using 4.6 on the new machine.

What is the easiest way i can import my data from the old 4.5 site to the new machine.

Raj

i upgraded from 4.5.2 to 4.6.0
i had some problem in updating since it was not enough clearly specified which update should i run (the 4.5.0 one! :(

in any case.
now i got everything working
BUT search is not working
at the beginning it had problem and the db lacked properly installed search_index and search_total table.
now i fixed that but still search_total keeps being empty and all the searches i do give the same null result

any help ?

i have upgraded my drupal to 4.6.0.
i am running into some problems.
i upgraded the event module. did as expected and the event_upgrade.php seems to have worked.
But when i go to look for my event in the calendar block i cannot find them anymore....
can someone explain me wtf happened ?

They seem to be in the db in the new table structure. But they do not show up!!!