ON my timeline in Adobe Premiere CS5, when I use to join 2 clips, a black vertical line would appear, and 2 arrows (on each clip) would appear at the top of the vertical line to let me know the clips are joined properly without over lapping, or leaving space between them, etc. That line is gone; it doesn't appear any more. Help?!! Thanks.
Have you got snapping on?
As Richard states, it appears that Snap is OFF. One way to invoke Snap is with the S key, which will toggle it ON/OFF.