We've loved playing this map so far! Blue wool never worked even with the command block, but we soldiered on!
BUT, when we jumped into the nether at the portal provided, it only generated regular Nether - no CTM trial... We've mad it so far, but there's no course for those nether wools...
It might be that way if the map creator made the map in single player. See if the nether opens fine in single player. If it does, you may have to move the nether file in the proper location it should be while being played on servers.