What do Yellow Warning Triangles mean on Dependencies in Visual Studio 2017?

Question

I have just converted my PCL library to a new .Net Standard library and I have some Yellow Warning triangles on my Dependencies shown below:

During the conv

Answer 1

If you have the warning icon but no warnings and nothing appears to actually be wrong, right click the project > Unload Project > right click the project again > Reload Project. The icon appeared for a moment and then was cleared for me in Visual Studio 2019. This avoids a full Visual Studio restart.