Compiling Shaders warning in Unreal Engine 4.18

Good day.
Some days ago, i mistakenly terminated the Unreal Engine 4.18 startup process at 45%.
After that, whenever I launch the engine, it shows in the lower right corner a dialog box saying “Compiling Shaders” with a warning exclamation mark at the left. Thousands of shaders are compiling without end, apparently. I left the pc (Win 10) on for several hours whith the Engine running, but nothing changed.
For this reason, no material is rendered in the Editor.
I’ve tried restarting project from scratch, deleting the project and complete reinstallation of the Engine. Nothing helped.
I’m completely halted.
Please help
Thanks in advance