Hide Lightbox at ZBrush's start.
I didn't want to see the Lightbox at start from ZBrush. I search for an issue, Marcus from ZbrushCentral get it. here:
1. Locate the DefaultZScript.txt file in the ZBrush 4.0\ZScripts folder.
2. Open the file in Notepad.
3. Edit the file so it looks like this:
//startup [If,[MemGetSize,Startup_Mem],, [MVarDef,Startup_Mem,1,0] [IPress,Preferences:Lightbox:Lightbox] ] [pd]
4. Save the file.
5. Restart ZBrush.
Lightbox will probably appear briefly but will not stay open. You can open it any time by using the comma (,) key.
Here the original post.