The dashboard is packed into the html files in the .tar file that has the ios,which is why you need to reimage it again to see if it had a conflict while transferring from the tftp server during the process.Sent from Cisco Technical Support iPhone Ap...
I upgraded all my switches (3)x 2950 this morning with the same version and they worked perfectly with dashboard... So i would reccomend reinstalling the ios on switch 1 and see if it works. And also the html file size should be around the same size ...