It seems that the Tuesday night Microsoft XP (KB967715)patch has disabled the auto run U3 of my SanDisk. I can no longer access the files on the U3 protected disk. I tried the SanDisk on an unpatched computer and it was fine. I installed the patch on the second computer (the one that worked with the SanDisk) and this second computer now can not access the files. Went to a Third computer without the patch and I can now see my files.
I tried backing the patch out of the first computer and am still unsuccessful at getting to my files -- must have done something in the Registry that I cannot find.
There have been a couple other people that have reported the same experience on a SanDisk forum. One of them is not using any of the U3 features -- and the same SanDisk is accessible on the same computer when booted to Linux.