Actually, the problem is a little more subtle than originally described. It has nothing to do with clicking and everything to do with mouse position. If the mouse cursor is over the title area of a fence ('four way' drag cursor) or one of the edges/corners (i.e. any of the resizing mouse cursors - vertical, horizontal or angled) and moves directly from that position to any window without first going over the desktop, then the mouse cursor will be 'stuck' when it is over the file list portion of any Windows Explorer window.
The key (to reproducing the problem consistently) is to avoid moving over the desktop, which will 'reset' the mouse cursor to an arrow, before moving to another window (Windows Explorer or otherwise). The cursor will remain 'broken' for Windows Explorer, from that point forward, as long as you avoid going over the desktop (including the space inside your fences).
I would be curious if someone could try this again on Windows 7, with the new information, to see if it is truly unique to Windows XP (running XP Pro, myself).
- Grant