I stupidly dragged a talent (that generic heal that summoners can get) off the bar and it disappeared. It's not in the list of talents you get by clicking the tiny control in the lower right corner of screen. Can't drag it from the levelup screen. Right click on toolbar does (disappointingly) nothing.

Thanks for your reply. The menu that you speak of looks like the same one I was describing. I got to it by clicking the telescope-looking-thing in the lower right-hand corner. The tooltip for this menu says: "Left Mouse To Show Talents". That menu did not display the talent that I lost, for some reason.

I can't go back and check for the "m" menu you describe because I lost that character soon after I lost the talent from my bar.