I encountered an error when deleting the Reject flag in the viewer environment, which can be replicated using this procedure:
1) In the iMatch environment, I select several photos and mark them with the "Reject" flag, for example using the "X" key (Screen 1)
2) In the Viewer environment, I browse through these photos and gradually change the Rating (Reject, Star..) using the mouse (Screen 2)
3) If I use the mouse to remove the Rejected flag (second photo), the flag is removed in the preview, but it remains in the actual photo (Screen3). If I use the keyboard to change the flag, it is fine (Screen4)
It's not a big problem, just a minor inconvenience...
Mario, thank you for your work!
Fixed for the next release, thanks for reporting this.