I have an old 2003 project which has been updated over the years so that it now runs in VS 2010 with FW 4. I cannot seem to get it to retain Configuration=Release. I know where to change it, and have done so numerous times. But if I close the solution properties window and reopen it (without even closing the solution), Configuration=Debug again. It also will not produce a Bin/Release folder when I attempt to compile it after changing Configuration=Release. The application has other problems, too, such as although I can see the project file in the application folder, it does not appear in the Solution. Thinking thiis was the problem, I tried to add a project to the solution and the option does not appear to exist?

Can anybody suggest anything to try before I abandon all hope and create a new solution?

It always worries me when my question gets a large number of reads but not an iota of speculation. For lack of better advice, I'll create a new project and move the source code to it when I have time.