I am running Drupal 7 with the latest CKEditor version and the activation looks like it is working

But there is no "CKEditor" to configure when I hit configure and when accessing permissions I get the following message:
PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'mydatabase.ckeditor_settings' doesn't exist: SELECT s.* FROM {ckeditor_settings} s; Array ( ) in ckeditor_profile_load() (line 307 of /var/www/mysite/sites/all/modules/ckeditor/ckeditor.module).

During the reinstall I also noticed the following message:
DatabaseSchemaObjectExistsException: Table ckeditor_input_format already exists. in DatabaseSchema->createTable() (line 657 of /var/www/mysite/includes/database/schema.inc).

I am running mysql Ver 14.14 Distrib 5.5.31, for debian-linux-gnu (x86_64) using readline 6.2

Comments

Apparently it seem to have been some kind of conflict with the WYSIWYG editor.

I solved it by just switching to the WYSIWYG module which works very well.