I had the issue that my Massive plugin could not be loaded inside Maschine 2 when I selected a Massive preset. The reason is that there are x32 versions installed which conflict with the x64 version, as far as I understand.
At these two file locations were double x32 plugins installed. Delete them and then rescan the plugins inside Maschine. I am working with x64 DAW and plugins so there is no need to have them.
C:\Program Files (x86)\Vstplugins C:\Program Files\Native Instruments\VSTPlugins 32 bit
If you have any questions you can contact me.