Redmine › Project Settings

I installed your sections plugin on:
Environment:
Redmine version 2.5.2.stable
Ruby version 1.9.3-p547 (2014-05-14) [x86_64-linux]
Rails version 3.2.19
Environment production
Database adapter Mysql2
SCM:
Git 1.7.9.5
Filesystem
Redmine plugins:
project_colors 0.0.1
project_section 0.0.2

I did not receive any erros while installing your plugin and the redmine log file does not show any errors either.
Yet the project list displays all projects in the same way even though ServerManager belongs to section develop and Dummy and Dummy2 belong to section Kunden.

I do not know what is going wrong. I am a Unix system administrator with no knowledge whatsoever of ruby, so please phrase your explanation like I was 3 years old.