Easy EDA is a great accomplishment. I have found a case where vias are not copied and pasted - possibly this is only related to a MAC computer that I am using.  I am using CHROME as my browser. FAIL:  If I use CMD-A to select all the objects on a PCB,  I see all objects highlighted including vias.   I then press CMD-C to copy  and CMD-P to paste.  I find that the vias are missing for the objects that are pasted. SUCCESS: If I select all objects  by dragging a selection rectangle around the items again I see all objects highlighted.  I then press CMD-C to copy and CMD-P to paste.  I find that everything is correctly copied. Hope this helps you make Easy EDA even better.