Hi,
I found my problem. The file GZIP386.exe was (somehow) missing from my Guide folder. When I put it there the DSS Internet images worked.
If you are missing this file, you can find it here:
https://www.projectpluto.com/update7.htm#web_dss_fixin realsky.zip
I really appreciate having DSS working, as it helps with my variable star observing.
Thank you for your replies,
John