Then I'm not sure what you meant with "even though I have all the networks saved" - the list you get with the Add button here, is the list of IRC networks (aka groups) listed in the mIRC options (alt+o) under Connect -> Servers. If you get an empty list here, then you probably have an empty list there, too. In that case, you could try reinstalling mIRC and selecting the option to install the file servers.ini, which contains the standard list of servers and networks.