What a waste of my time.
It's all sorts of messed up just because I don't run my IIS development on port 80.
It tells me I don't have permission to build reports when I'm logged in as administrator.
There's no apparent way to change the datasource on the fly.
I guess it would be a great thing if I was serving these reports on a LAN and everything ran on port 80 and only windows authentication was used.
Fed up with it now though, I'll just dispay report data in the damn datagrid.