Since DO9 when clicking a menu button (pulldown menu) with one click and moving directly to a command within the menu DO seems to make a "hidden second click" and execute a menu-command (depending where mouse was moved over before). This happens really often.
Example: Clicking on settings menu and moving down directly DO opens copy-filter-settings for example.
I really press the left mouse button only once a time. Also I didn't changed double click rate or something else. The mouse is ok, no other apps behave like this.
I suspect you're moving the mouse before releasing the button, after the first click.
Menus work in two ways. You can either:
[ul][li]Click (hold), move and release.
Or:
[/li]
[li]Click, release, move, then click again.[/li][/ul]If you are trying to do the second method but move the mouse over an item before releasing then you'll end up doing the first method and selecting an unwanted item.