I recently updated my MacBook Pro to Monterey (OS12.0.1). Using SketchUp 2021 (for Mac) I make a few changes to the model and save it OK, then about every 5 minutes I am getting a file locked message when I try to save. This occurs even though I have full read and write access to the file itself (and all its enclosing folders). I have to quit without saving and start again.
Anyone else having similar behaviour?