39. Using the Multi host plugin in Bitwig Bitwig uses a sandbox process to host plugins. If you remove the  last  MP Multi host plugin and try to load another one, Bitwig will not be able to load it. One option to address this problem is to always keep one  Multi host plugin loaded.   The other option is, if you have removed the last one Multi host plugin, just double click on the MPHCSM.exe (Windows in the ~/MP/Host folder) or MPH Cache.app (Mac in Applications) to clear the cache and load the Multi host plugin. Important: In Bitwig setting > plugins > Plugin hosting mode set it to: Bitwig or Together or Vendor