Hi,
Are all the included instruments like Cakewalk sound centre in 64 bit now within the Sonar X3 Producer?
Or are some 32 bit whilst some are 64 bit? 

Cakewalk Sound Center, DropZone, RXP and Square I have never been ported to 64bit so they still show up as 32bit plug-ins in X3. Cakewalk Sound Center is nothing more than a DimPro and Rapture program player. Both DimPro and Rapture are 64bit plug-ins. It is possible to use CSC content in DimPro and Rapture although the presets will have to be recreated; the prog files are not portable.