Unrecognized junction points in shared folders

Here's the setup: I have two PCs in a workgroup which I'll call A & B.

A is running Windows XP Home SP2 and has a shared folder that contains a
series of subfolders that are junction points. B is running Windows
2000 (no service pack specified). B can access the shared folder, and
*some* of the junction folders inside it, but trying to open other
junction folders generate an "Access Denied" message.

What could be causing this? What would cause computer B to be able to
access the shared folder on computer A and *some* of its junction point
subfolders, but not others? (All the target folders the junction points
point to are on the same partition on A, if that makes a difference.)

Dave

Dave Hardenbrook