Move all precompiled libraries into a new, separate project under common, and use that to copy them all to the Common output directory. Also, reference all DLLs within projects to the common location, to ensure the DLL referenced will be the one that is used.
Fix the VisualBasic.PowerPack references -- have the common library project reference it and copy it, to make sure it goes into the Common output directory. Blergh. :-(
Fix the DLL path for the parallel port modules.