Even tho I untick Drag Lock in Settings, still when I double tap, move the window and release the finger from trackpad, window is still locked to trackpad, I have to tap again to unlock it. Anyone else met this problem? Running the latest Snow Leopard, 15" i5 MBP.
I just tried to reproduce this and found that there is a small delay before the window stops moving with the mouse after you remove your finger from the trackpad, even when Drag Lock is disabled.
If you wait a little bit (say half a second or less) before moving your mouse again it should "unlock" from the window. At least that's what it does on my laptop.
I'm using an early jan-2008 MBP.
Hope this helps!