Window Layout Not Restored

I have Cubase Pro 8.0.10 running in 32bit mode on a Mac. When I open a project that I have previously been working on, the window layout is not the same as when I saved it. The arrange window has shrunk to a small size and none of the other windows I had open are there. The mixer, VST Instruments, Plugin windows, Instrument editors e.t.c. are all gone and have to be manually reopened again.

It has always been like this since I upgraded to Cubase Pro 8 last year. I am having to work using version 7.5

The other problem with Cubase Pro 8 is that if I open Spectrasonics Stylus RMX, then that plugin editor window always stays on top, even though I have disabled this in the preferences.

Any advice or fix would be welcome. Thank you.