Also to point 1.
That is very dependent on your bigbox startup time, there is a option in settings to tell bigbox to delay launching for anywhere between 0-30 seconds if you are using a startup video, you will just have to test what works for you as every pc has a different startup time.
Oh and point 2. You can go to options/image cache and force image caching, you will have to wait for it to complete, but should eradicate that grey box issue.