Nsd runs anyway after a "cancel"

I am on the Eclipse client in Notes 8.5.3.

Often when I remove a few bookmarks from Designer, Notes crashes. OK. Then it offers me a dialog to cancel diagnostics, then another. Even though I cancel, nsd.exe starts to run and takes 50% of my processor in Task Manager (it is a two-processor PC.) Ten minutes later, the situation is the same. Is there a workaround?