Most likely you have added the script step to NOT show the tool bar either in one of your scripts or a layout trigger.
As I have posted elsewhere I use a default script that sets everything as I want it whenever I open a window, change layouts, etc. I tried using this as a layout trigger but ran into lots of problems and so I avoid layout triggers and use a perform script step.
Ignoring my preference, you could create a script for OnLayoutEnter that will set it as you prefer.
Thanks for your help. I am using a Starter Solution, and found a layout script trigger hiding toolbars.