Not sure why, but clicking that 'Make Defaul' never works at our company who is on Version 15 of SiteCatalyst!!!! Please update for v15 users....thanks!
The latest version (15 currently) should always be the default.
It should be really easy to program the login page so that the first value in the list is the default one.
We cannot rely on 'remember me' cookies, because we have to clear cookies regularly during testing, so there is an unnecessary extra click, every time, just to log in.