I have tried this myself but I cannot guarantee that its a permanent fix till I have used both cameras again in this mode.
Go into the main spanner menu and page 2/4 will be Economy
Inside this menu look for Power Save LVF Shooting
By default the time is set to 1sec
Change this to the OFF position as shown above…job done. My thanks to Geoffrey Callens for this fix.
The OFF setting was the default on my version. Is it possible that the Mac downloads are different to the WIN PC downloads in this regard?