**"Couldn't Download"

I was using LW 1.4 (I believe) from behind a firewall with fair success. Either things downloaded, or they kept cycling through busy waits.

At some point last week, all of my requests began showing a status of "Couldn't Download" at the point when they normally would have begun downloading. Now, people can still get MY files, no problem.

First, I got out from behind the firewall (same computer), and that did not help. Then, I installed 1.6. That did not help. Then, I got back behind the firewall (which is a router) and set my computer as the DMZ host (which should have made the router invisible). No help. So, I forced the IP. No help.

I reinstalled 1.4. No help.

Help?