In Visual Studio when you setup a solution, you can create "solution" folders and have project displayed inside of those in the Studio solution browser.. It appears that VSlick no longer recognizes those filters and when opening the same solution in Slick Edit the projects all appear outside of their "solution" folders.. I have attached a zip file that is a simple Studio 2015 solution that contains 1 single CSharp project and a solution folder created for the project.. In visual studio, the project correctly appears in that folder, but not in slickedit 21 prior versions of slickedit do work properly.