I have learned that the version of your browser may affect some things. I use Netscape, and when using version 6.2, I have a few problems, when using version 8.01, I don't, but 8.01 bombs out sometimes.
Have you tried just 'Googling' Shockwave, and then going to the official site for downloading, and if so, perhaps selecting a different location to download it from (if multiple physical sites are given for downloading)
The problem I seem to have is that after rebooting and going to Cuetable it works fine, and maybe 2-4 times after that, but if system has been on a long time without rebooting, and go to Cuetable, it does not recognize that I have Shockwave 10.1, and asks me to download it again.