My team is currently developing across multiple development platforms. We are using some of our own assemblies with Unity, but our current version of the assembly references System.Web and System.Web.Services, which appear to be missing in the Mono Compatibility page.
The strange behavior comes from running on the Mac vs Windows. On the Mac and iPad, everything runs fine and everything compiles inside MonoDevelop without any problems. When I bring the project over to the PC, Unity won’t load the .dll. It complains about some missing references (in an obscure way).
If I copy those referenced assemblies into the asset folder (System.Web, System.Web.Services) from the .NET 2.0 folder on Windows, those errors go away and Unity can play the scene. MonoDevelop, on the other hand, will not compile with those libraries in there and anytime I make a call into our custom .dll, I get a message saying:
Exception Caught: The requested feature is not implemented.
Now I understand this error is thrown because this subset of functionality is not available in older versions of Mono, but that doesn’t explain why the Mac version works just fine, even without additional assemblies and without errors of any kind. I would assume that the mobile version of Mono would have even less functionality, but again, the iPad can make all of the calls just fine.