I have been seeing posts about why the new and sudden change with ZB4 start up, so thought I would offer up a fix. I was playing around and found a work around.
In your ZBrush directory go to ZScripts, rename the text file there to backup or whatever. Create another text file name it “DefaultZscript.txt” now open it and simply paste the below and save it. Next time you boot up ZBrush 4 it will start in edit mode like 3.5.
//startup
//[If,1,[FileNameSetNext,“ZPLUGS_SplashData/Startup.txt”][IPress,ZScript:Load]][pd]
[If,1,[FileNameSetNext,“ZPLUGS_SplashData/SphereStartup.txt”][IPress,ZScript:Load]][pd]
Have fun
