1) the widget property "Name" is not kept and restores to the tool selected initial name
➡️ It's a bug, thank you for the report steve
2) it's hard to define a stable z-order for widgets
➡️ LuaRT don't support z-order, you have to set it manualy after loading a Window file
3) the RTBuilder sometimes may crash and leave the generated UI .lua file uncompleted and so no longer usable
➡️ I need more info on this, does it crashes during saving from what I understand ?
4) the toolbar with component icons may disappear
➡️ I can't reproduce this, can you post a screenshot ?