[horde] Horde categories and vCard

[Art]

Hi,
My setup is:

Horde 3.3.5
Turba 2.3.2

First thanks guys for an excellent product; the more I use it the better 
it gets!
One of the problems I'm having is with horde categories and vCard. 
Category filed in turba/config/attributes.php is set up as follows:

$attributes['category'] = array(
      'label' => _("Category"),
      'type' => 'category',
      'params' => array(),
      'required' => false
);

When I export my test address book to vCard everything is OK, but when I 
try to import it back, category is cut to the first letter and horde is 
treating it as new category.
Ex: if category in vCard is "CATEGORIES:Self" it will be imported as "S"
I first noticed it during sync with my Pocket PC, but I tested it with 
just a regular import/export from turba and it's as I described above. 
When I change the type to text in attributes file, horde imports it 
correctly.
So, I guess the question is if this is a known bug/somebody can confirm 
or if not how can I trace is it, and maybe you can tell me which 
file/function is responsible for matching horde categories?

Thanks,
art