Hi Ernie,
I'm running LAMS 2.0.4 and I couldn't find any 505 errors in any of the jboss or LAMS logs.
I did manage to solve the issue though.
I started looking at the $lession_url in add-2.tcl and noticed that '&title=$name' and '&desc=$introduction' were not being URL encoded so in the 'set lession_url "$lams_server_url/...' statment I added a 'ad_urlencode' to URL encode the vars '...&title=[ad_urlencode $name]&desc=[ad_urlencode $introduction]...' then everything worked as expected. I guess the spaces in the text of the URL was causing the 505 error.
Thanks,
Rob