Imported content doesn't show up

I don't know whether I'm doing something wrong or whether it just doesn't work, but I can't find any imported content.

What I do:
1) Export Wordpress to WRX.
2) Install the Wordpress Import + required modules
3) Go to Administer → Content Management → Wordpress Import and choose the WRX file

I get this message:

* Successfully loaded uploaded file "wordpress.2010-03-07_0.xml".
* The following elements were identified :
o 169 posts/pages
o 17 comments
o 3 authors
o 8 categories
o 690 tags

4) Settings:
- Posts → Story
- Pages → Page
- Manual
- No changes to advanced settings
5) After clicking "finish", I get these messages:

warning: Parameter 1 to wordpress_import_process_blog() expected to be a reference, value given in C:\Software\Internet\XAMPP\xampp\htdocs\drupal\includes\batch.inc on line 189.

Import successful :

* nodes
* users
* taxonomy terms
* comments
* trackbacks
* 0/0 images

6) I go to Administer → Content Management → Content, where no imported content whatsoever turns up.
However, when I log in to the database and search for a word from one of the imported posts, I can find it in the "ctools_object_cache" table.

I checked the batch.inc file that was referred to in the warning above. The following code starts at line 184:

if ((list($function, $args) = reset($current_set['operations'])) && function_exists($function)) {
// Build the 'context' array, execute the function call,
// and retrieve the user message.
$batch_context = array('sandbox' => &$current_set['sandbox'], 'results' => &$current_set['results'], 'finished' => &$finished, 'message' => &$task_message);
// Process the current operation.
call_user_func_array($function, array_merge($args, array(&$batch_context)));
}

I hope I have given you enough information to be able to determine the problem. I also hope I have posted this in the right place. If not, please do correct me.
I am completely new to drupal, I only started making a test site yesterday. It's running locally on my PC. I used these instructions: http://drupal.org/node/307956