This conversation has been merged. Please reference the main conversation: Lightroom: Double arrow cursor over panels
This issue has been there for a long time. Not sure whether it's already been in version 4, but it definitely is in any of the 6.x until today. I've seen other reports of this bug closed as fixed here, so I just try again, with a suggested solution.
As I guess the Adobe developers are not in control over their development tools, may I suggest handling the MouseEnter as well as the MouseMove events on that list control to update the cursor to a default pointer. It seems the cursor (which probably comes from the panel resizer at the right edge of that panel) is only changed back to default in a very tiny area between the resizer and the folders list, but not on the folders list control itself. You may not have noticed yet, but when moving the mouse from one point to another with sufficient speed, it will not be placed in every single pixel along that line, but it will skip pixels. If it skips the area that could properly update the cursor, then the cursor is not updated. When moving the cursoer very slowly, the issue does not occur. This is a fairly basic mistake that any trainee could make, but not very often. From my experience, I'm not expecting any greater level of experience from you, dear Adobe developers, so please use my explanation to fix that nasty bug, finally.