Launcher can not recognize all my Unreal projects. (Maybe some bug(?) of the Launcher ver. 7.5.0). Howecer, to open my project in its folder, there I found that the color of the Unreal project Icon is black as shown in the attached file. In normal case, it was blue. Now, I cannot select the Engine versions by right-clicking on the Icon. Does this black color show an evidence of expected problems? I have installed Windows 10 and Visual studio community 2017 and ue4 version is 4.19. Please give me ideas to solve the problem.