Please excuse the concise post here; I am in a bit of shock at the moment.
I have opened a mix which I have been working on for the past few days and I have noticed that all my third party plugin settings have reset to their insertion default settings.
So, all my Waves plugins, Transient Designers, bx_ stuff. All the settings are gone. The stock plugins are okay.
No changes to the computer. On every back up version of the mix, all the third party settings are reset.
I will try opening the mix in Cubase 6.5.
I had a consistent issue where one instance of a plugin (always on the snare track, is what I mean) kept having its settings wiped. All the other instances of the plugin were okay though, so I figured it was a plugin related issue. The fact the issue is now affecting all my third party plugins is shocking.