4.21 compiling shaders all time

this problem happens 4.21 not earlier versions. when i open project and add new material/textures it always start compiling shaders. it always is same number depending project like compiling shaders 355 etc. it never stops it is hole time compiling. i red that stopping incredibuild may help, but no affect. how to fix this. i have installed 4.21 two times again same problem. i cant do any projects with 4.21.