I placed the scanner with RE, switched to RE+ and opened the scanner GUI and this happened:
The mod Recursive Blueprints+ (1.3.2) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event rec-blue-plus::on_gui_opened (ID 87)
rec-blue-plus/lualib/scanner-gui.lua:495: attempt to perform arithmetic on field 'width' (a nil value)
stack traceback:
rec-blue-plus/lualib/scanner-gui.lua:495: in function 'update_scanner_gui'
rec-blue-plus/lualib/scanner-gui.lua:143: in function 'create_scanner_gui'
rec-blue-plus/control.lua:255: in function <rec-blue-plus/control.lua:239>
Edit: happens on newly placed scanners as well without any settings from RE.