Problem after transfering from 2.5.28 to fresh 3.4.3

Hello,

after transfering a 2.5.28 installation to a fresh 3.4.3 installation no events and categories are present (backend and frontend). On both installations version 3.2.19 is installed so I just copied the old tables to the new installation.

Here the support information from version 2.5.28:

PHP Version : 5.4.41-0+deb7u1

MySQL Version : 5.5.43-0+deb7u1

*** CONFIG NOT SAVED*** 

Fix jQuery? : Yes

Load JEvents Bootstrap CSS? : Yes

Load JEvents Bootstrap JS? : Yes

Max Input Vars ? : 1000

Club code set? : No  

Joomla : 2.5.28

component_com_jevents : 3.2.19

component_com_jce : 2.5.2

module_mod_jevents_cal : 3.2.19

module_mod_jevents_custom : 3.2.19

module_mod_jevents_filter : 3.2.19

module_mod_jevents_latest : 3.2.19

module_mod_jevents_legend : 3.2.19

module_mod_jevents_switchview : 3.2.19

plugin_content_jevents : 3.2.19

plugin_finder_jevents : 3.2.19 (not enabled)

plugin_search_eventsearch : 3.2.19

and here from 3.4.3 installation:

PHP Version : 5.4.41-0+deb7u1

MySQL Version : 5.5.43-0+deb7u1

Fix jQuery? : Yes

Load JEvents Bootstrap CSS? : Yes

Load JEvents Bootstrap JS? : Yes

Max Input Vars ? : 1000

Club code set? : No  

Joomla : 3.4.3

component_com_jevents : 3.2.19

component_com_jce : 2.5.2

module_mod_jevents_cal : 3.2.19

module_mod_jevents_custom : 3.2.19

module_mod_jevents_filter : 3.2.19

module_mod_jevents_latest : 3.2.19

module_mod_jevents_legend : 3.2.19

module_mod_jevents_switchview : 3.2.19

plugin_content_jevents : 3.2.19

plugin_finder_jevents : 3.2.19

plugin_search_eventsearch : 3.2.19

The tables on the new installation has the same content as on the old one. If I create a category on the new installation with the same name as on the old installation then all events of this category are present and displayed. In the backend also as in the frontend.

Strange: The ids of the categories are different (146 on the 2.5 installation and 405 on the 3.4 installation).

I also wondered why the table "jevents_categories" are empty on both installation?

There are no users defined in Jevents and the used transfer tool "SP Transfer 3.7.0" transfered the user correctly. As far as I can see (it is not my site) all other stuff transfered correctly.

I would recreate the categories if the were not so much (about 100). So what can I do to get this categories back and/or why does it not work?

Thanks,
Peter