I faced this problem after upgrading from CMSMS 1.8.2 -> 1.9.3
Not sure if the problem is in Cataloger or Contentaliases module, but decided to
put it here.

Everything is working ok in the production enviroment:
- Linux 2.6.24
- Apache/2.2.8 (Ubuntu)
- PHP 5.2.11-0.dotdeb.1
- MySQL 5.0.51a
- CMSMS 1.8.2
- Cataloger 0.7.7
- ContentAliases 0.6.8

Problem arise after upgrading to:
- CMSMS 1.9.3
- Cataloger 0.9
- ContentAliases 0.6.11

I was able to reproduce the problem in my local WAMP enviroment as follows:

New install on WAMP
Wampserver 2.0
- Apache 2.2.11
- PHP 5.3.1
- MySQL 5.1.33

- CMSMS 1.9.3
- Cataloger 0.9
- ContentAliases 0.6.11

How to reproduce:

A. Within Cataloger define one User-Defined attribute for Items. Ex. Text-type
field

B. Add this field to "Category-CSS-based" -template

C. Create following page structure
1        Home (normal page)
2        Category page, Sub - Template = Category-CSS-based
   2.1 - item page
   2.2 - item page
3        Category page, Sub - Template = Category-CSS-based
   3.1 - content alias page (target 1st item page 2.1)
   3.2 - content alias page (target 2nd item page 2.2)

Now in 1st category page you can see data of user-defined-attribute field
together with other "standard" fields data. This field data is missing in the
second category page where the items are content aliases.
If you select ex. 3.1 content alias page from the menu, the the data from the
user-defined-attribute field is visible there as it should. So the problem
appears only in the category page display.