Yes, I am. Yesterday I actually tested both of the functions, but the results in the both cases were incorrect as you could see in my screenshots. The file had been open for hours as I tried to Mirror a row. Maybe CB8 was “tired” about using such functions after working for a long time without a break 
The “reverse” function gave a different kind of result (error). I tried to find the “Retrograde” operation for a note row within the Logical editor, but without success.
NB. The Cubase Project I worked with was created with version 7.5
---------------------------- a few hour later --------------------------------
Now I retested the “Mirror” function in a brand new file and … a pleasant surprise … the Mirror worked well.
After that I opened the file which caused the problem yesterday and … another pleasant surprise again … the Mirror worked as it should.
So, let’s close the case for now. I will inform you or other in the Forum, if the problem returns.
Thanks for been active and helpful!
Erkki Finni