@C_R 

Again, very clear explanation. As you said, it misslead me to number of finite elements along the beam. Term "elastic coordinates" is poorly explained in Help files. I will explore what it actually does in the solving process. 

For me, an interesting thing is that when you put i.e. 2.5 as a EC, it still gives you propper solution, even it is not an integer. 
However, thank you for your time and detailed explanation. 

@C_R 

Thank you for you answer. I have probably missed the info about height-widht orientation in help file. But now, it works fine.

And also did not knew for the EC meaning, and still it is somehow blurry. As I understand, higher EC the better results, but more processing time. Since I want to know what it exactly means, could you give me another hint? Is first coordinate deflection, and second coordinate angle? Or EC number has some other meaning?

Dear Joe Riel,

thanks for your answer. A have forgotten to attach file.

Konzola.msim