And so it never happens again set some UI Memory Dots. Set a dot for the default layout in each room. Poser 13 has additional setting for the user interface to make recovering from an accidentally scrambled UI easier. For Poser 11 and 12 UI dots will save your sanity.

Here's all you want to know about them:

https://www.posersoftware.com/documentation/13/index.htm#t=Poser_Reference_Manual%2FBuildingScenes%2FPoseRoom%2FMemory_Dots.htm&rhsearch=ui%20dot