I had an incident this weekend with Mixcraft 6 Pro (current version). I had a track that I used a third party plugin on and it prevented Mixcraft from shutting down. I used the log to track down the bad plugin, removed it from the track, but Mixcraft still would not close. I ended up removing the plugin from the VST folder completely and it cleared up the issue. Now the question becomes, if I told Mixcraft not to use the plugin (by removing it from the track) why would the project still want to use it (load it)? (Could it be the back up versions of the project still had the bad plugin loaded to the track?) I know that all plugin directories are scaned and loaded at start up, but if the project does not use it, why would it prevent a project from closing. By the way, the project saved fine, Mixcraft would just not shut-down. I had to manually stop the process.