This is an ages-old prob. for my use of t-bird, going back dozens of yrs (version irrelevant). Windows only, since I hardly use MacOS & don't know if prob. exists there. -In the "msg list" pane, I will put cursor on a message, to highlight & (click to) read its contents below in the "msg pane." Please note, another msg may already be in the "msg pane." That msg is already there from the last time I had opened t-bird. -I click on the highlighted msg in the "msg list" pane. It does NOT open. Instead, the highlight MOVES ITSELF to an "old" msg header in "msg list" pane (the header related to the msg previously opened before, as stated above). It's hard for me to express this, but easy to see. In the end, I have to move the cursor AGAIN (in "msg list" pane) to the desired msg I want opened. This has been endlessly irritating in a small way. Is there a fix for this? Thank you.