Check the VST scan path if running 64bit SONAR. IIRC, the Beatscape dll installs in "C:\Program Files(x86)\Cakewalk\Vstplugins" which is not included by default in a 64bit installation. I believe I copied the dll into "C:\Program Files\Cakewalk\Vstplugins\Beatscape" by hand to avoid adding the 32bit path.