@unknownuser said:

Here is the solution, which I just confirmed on my Windows machine.

There is a built-in site-blocking file on EVERY Windows machine, called the "hosts" file (no extension.) Macs may use a similar file. On my Windows XP machine, it is located in the following directory:

C:\WINDOWS\system32\drivers\etc

Look for the "hosts" file. Open it for editing with Notepad. Use <ctrl>-F, to open Notepad's "find" window, and search for "buysellads". (I found two instances in my hosts file.)

Append a "#" character to the beginning of the line. (This will cause the line to be treated as a comment line, rather than a valid block entry.)

My case:
...
127.0.0.1 buytraffic.cn
127.0.0.1 s3.buysellads.com
127.0.0.1 stats.buysellads.com
127.0.0.1 buzzclick.com
...
When edited:
...
127.0.0.1 buytraffic.cn
#127.0.0.1 s3.buysellads.com
#127.0.0.1 stats.buysellads.com
127.0.0.1 buzzclick.com
...
Save the file. Reload your browser. (I use Chrome, and don't have to reload. A page-refresh is sufficient.)

The problem: Uploaded images and attachments being stored at an internet address that is a recognized ad/spamming source.

Many ad-blocking programs revise the "hosts" file, as part of their blocking methodology. You can always edit yourself, if you encounter a website that is being blocked, and you need to permit access.

If SketchUcation is going to continue to use "buysellads" or comparable host for file storage, these instructions need to be posted as a "sticky"

-Taff

This eventually worked, but took near 5 hours to end up at given that no web search I attempted pointed me to either this thread or that post.

Hopefully now I can participate in the site and SketchUp somewhat better, and that the plugins between here and Ruby Library Depot can correct some of the issues I'm either causing or receiving.

Happy drafting.