When I checked out FlexWikiCore, I didn't get the settings necessary for debugging. Here's what I did to set it up.

It's definitely easiest if you are running as an administrator on your development machine. It's not impossible to do it as a non-privileged user, but you're on your own.

1. First, make sure you've built FlexWiki and can access your Wiki at http://localhost/FlexWiki/.
2. Set FlexWiki.Web as the startup project.
3. Change the project properties for FlexWiki.Web as follows:
1. Enable ASP.NET Debugging: True
2. Debug Mode: URL (click Apply after setting this)
3. Start URL: http://localhost/flexwiki/default.aspx
4. Set a breakpoint at a convenient place. I set it at WikiEdit.DoPage() to see Wiki start up normally before hitting a breakpoint.
5. Click Start, and edit a page or do whatever it takes to hit your breakpoint.

Happy Stepping!