I have a Windows 10 Lenovo machine running LRT 5 build 618. When I open the program the Render Video window opens and you can't close it, without two screens you couldn't see the program at all. At the same time, the Keyboard is totally inoperable, you can use the mouse just not the keyboard. I have tried removing the program totally and re-installing a brand new version, didn't change anything.

Delete the folder Documents/LRTimelapse - this will clean the interface between LR and LRT which might have got stuck.