This is now reproducible and may be the same bug as bug#13179.

To reproduce:

Start workbench estudio and run estudio from within it.
Open existing project.
Resize main window so that it is not too wide (width of main window seems to
   matter).
Undock Address toolbar and dock in top row with Standard Buttons.
Do the same for the Project toolbar and Refactoring toolbar.
Click twice on one of the Toolbar Options buttons in the single row of toolbars.
Estudio crashes with precondition violation (trace attached previously).