Hello everyone!
I have encounted a huge problem with the exporting (rendering out) all contents of the Composition in After Effects CC.
My workflow outline:
1) Created a Composition of 1920x1080 size.
2) Created a Solid Layer of 3840x2160 size.
4) Animated Scale and Position of the Solid Layer over duration of the Composition.
3) Created a Shape layer containing the Shape 1 using the Pen Tool. The Shape 1 is just an unclosed path from point A to point B
with the Stroke of 20 px width and no Fill applied.
4) Made my Solid Layer as the Parent of the Shape Layer.
5) Added a Trim Paths to my Shape 1 in the Shape Layer (containing Stroke 1) and animated End over the Composition duration.
I have also animated the Stroke Width from 20 to 30 px.
The Composition is playing back perfectly in Composition window inside After Effects CC:
Animated Line is going from point A to B while the Solid Layer changing position and scale all right!
6) Rendered the Composition out (using Render Que as well as Media Encorder CC) into a movie file.
When I play the resulting file I cannot see my animated Shape 1 Stroke (Trim Paths) in the Exported (Rendered out) Movie file:
no Animated Line is present while the Solid Layer changing position and scale... 
However I can see the Solid Layer animation (Scale and Position) in the Movie file.
Why the animation can be seen in the Composition playback inside the AE CC but I cannot export it?
What am I doing wrong?
Thank you very much in advance for your advice!