[cache]

re-copying vbulletin database
I am trying to move my old domain with only vbulletin forum to a new domain
with vbulletin forum plus vbdrupal. This way I can do some experiment with druapl
without disturbing users at the old domain.

I did the following steps:

1. created a new blank mysql database called newdatbase, and
copied the vbulletin forum database olddatabase to newdatabase
(first use mysqldump ... olddatabase > output.backup
and then mysql ... newdatabase < output.backup
)
2. then I installed vbdrupal
everything is fine with installation.
I then added some modules to drupal part, and customized the drupal.

3. by the time I finished step 2, a few days already passed by, users at
the old domain already updated the forum database. I thought I could just
copy the database from the old domain to the new domain again, however
after the database copying:
mysql -u xx -p xx newdatabase < output.backup
the drupal part is no longer working, I got a blank page. It does not
matter whether I sync the users, or update vbdrupal, or redo settings.php
I always get a blank page.

What is my solutions? Do I have to delete the newdatabase (I am not sure
what is the command to empty the newdatabase) and lose all the drupal
changes or there is a way that I save my work ?

Thanks.