I am using LibreCAD 2.0.2 under Linux Mint 17.1
Unlike other drafting programs, the LibreCAD 'move' operation applied to multiple entities on more than one layer does not appear to keep the entities on their respective layers, but simultaneously moves them all to whichever layer is currently active. This is a nuisance.
In "move/copy Options" dialog uncheck "use current layer"
Note: current stable version is 2.0.7
My bad. Sorry.
No problem ;-)