Version: (5.0.0-rc2-dev-720-g9704891c8), release build on Windows 7:
Tried to load rather complex board.
Selected cia_acc.pro for the test from here:
When invoked, the PCB Layout editor showed empty page.
I was able to get PCB displayed after switching to Legacy Toolset.
Switching back to Modern Toolset showed nothing again.
I haven’t installed my Linux machine yet so I can’t comment,
how does the Pcbnew handle this board on Linux.
Note that my very simple 2 layer board with few components is displayed correctly
in Modern Toolset mode.