Did you check all the map size lists?
If so, the map may have a different name added into the galaxy file. Open it in notepad, and on the 5th line there should be browsename. If the following brackets contain anything look in all four size lists for that name.
EDIT: Just remembered, don't put the .galaxy files anywhere but the galaxy folder in the install directory. Otherwise it will crash on load (or it may be whats causing it not to show up).