Depending on the selection state, sometimes, dragging a path segment leaves one of the control handles floating in space during the drag.
Repro:
1) draw a circle
2) deselect the circle
3) using the selection tool, click on the path segment that defines the upper left quadrant of the circle. At this point, the control handles which define the point at 12 o'clock and 9 o'clock should become visible*.
4) click directly on the anchor point at 9 o'clock. Nothing appears to change.
5) Now mousedown on the path segment (the same one you clicked on in step 3) and drag it. You will see that the 12 o'clock control handle stays where it was while you're dragging this around.
This is a display-only bug.
bonus buglet: if you choose the upper right quadrant of the circle for step 3 instead of the upper left, only half of the 12 o'clock control handle becomes visible. I'm not sure why.
Depending on the selection state, sometimes, dragging a path segment leaves one of the control handles floating in space during the drag.
Repro: 1) draw a circle 2) deselect the circle 3) using the selection tool, click on the path segment that defines the upper left quadrant of the circle. At this point, the control handles which define the point at 12 o'clock and 9 o'clock should become visible*. 4) click directly on the anchor point at 9 o'clock. Nothing appears to change. 5) Now mousedown on the path segment (the same one you clicked on in step 3) and drag it. You will see that the 12 o'clock control handle stays where it was while you're dragging this around.
This is a display-only bug.