Can a map be non-downloadable?

I recently made a map. A server (Baron's Pub 66.55.149.227:27015) I play on often attempted to put it up for rotation. However, when it switches map and people go to download it, it will not download. Only people who had already manually added it to their maps could play it. The owner of the pub has no idea why, considering he already has many custom maps up that all seem to download just fine.

The map in question is ctf_WaterWorks_v2
http://forums.tf2maps.net/showthread.php?t=3456

Could I have possibly done or not done something to cause this? Can you think of any reason this might happen? Or do I have a genuine mystery on my hands?

Alright we'll be giving it a try sometime soon. I'll let you know the results.

The capital letters seemed to be the culprit. I made sure to fix the old version and not to repeat the mistake in the final release.

As always, thanks guys =)