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1.Open any c or c++ file in editor space, 2. open Tools/Options/Advanced Options/Editing/Editor Settings/C and C++ Editor/Font and Colors/ 3. Change any option without "cc-" prefix. Font, Background Color or Foreground Color - any. 4. Push Ok, Ok, Close in opened dialogs. 5. Changed options have no effect in opened source file. 6. Restart netbeans => changed options have no effect in opened source also.
Hope it will be solved after moving on new Options engine
*** This issue has been marked as a duplicate of 76384 ***