Monodevelop-built DLL not recognized by Editor

Hi Gang, I used Monodevelop to build a DLL with these properties: - targeting Mono/.NET 3.5 - Disabled 'Mono Soft Debugger Support for Unity' (http://screencast.com/t/6Qf5NILS) - put resulting .DLL and .MDB file in Assets/Assemblies/ - (These are all the troubleshooting steps I was able to Google) - (My DLL does not contain any monobehaviours) The problem is that my Unity project doesn't seem to recognize the DLL and won't let me view any of the contained classes: http://screencast.com/t/ZBuaXBkZ1h (the second file is the .mdb file). As a result my scripts won't build because it's unable to resolve any of the namespaces being referenced by my main script. Is there anything obvious that I'm missing? Unity 4.5.4f1, Monodevelop 4.0.1 (stock). Thanks in advance!