Im unable to add a reference to System.Data.Linq to my project, I get the following error
The referenced component
‘System.Data.Linq’ could not be found.
Even though i added it through the Add reference screen and my other projects add it without issue. This is how it looks in my project

And this is how it appears in my other project using the same reference

Any ideas why this happens, both projects us framework 3.5
Thanks
Sp
Is it possible that the failing one is set to the “client-only profile” of .NET 3.5?