I also found in some cases certain design-time errors go away by closing and re-opening Visual Studio. I used to pull my hair out trying to fix those errors; n

I also found in some cases certain design-time errors go away by closing and re-opening Visual Studio. I used to pull my hair out trying to fix those errors; now if I get an error I don't understand it's a clean/rebuild cycle first and a close/reopen second. I kind of feel VS is getting less stable as Microsoft embraces the packages-for-everything style that is pervasive in web development.