A few days ago I graded a long project, saving several versions as I go. We needed to collect files and copy to a new location which was left overnight.
I later reopened my project to find that a completely random selection of clips have had their grading reset. This has been done on the same clips of even the backups. I mention the 'collect files and copy to new location' because i noticed the grading bug happened after backups before but to a very few number of clips.
It's not that I have pressed the FX button to disable the view - the effects have literally been reset to 0. This is not great as it's gonna be another few hours work to redo the colour, for it to probably happen again.