IgorB:

If You agree with me, is it possible to do a little refinement about alignment?
No problem.  It looks better now.  There is a Ubuntu16 build if you have any spare time to check it out at:
   https://www.cinelerra-gg.org/download/testing/cinelerra-5.1-ub16-x86_64-static.txz

The Git checkin and this build include the addition "back by popular demand" of the load mode icons for the Insertion Strategy in the Load Files, Render, Menu Effects, and Record gui-s.  gg/Phyllis