I belive they are enterig their skype account name. I myself have tried entering a variety of words and sentences into it (none of which were rude or bad) and it still didn't save when I pressed save.
Ape probably removed the skype from the account once he completed his tests.
The main thing that Ape was pointing out is that there is no bug with the system. If it is not saving, then you or your member are probably not putting your skype account info in correctly.
No i did not remove the data in entered for my tests and i have just logged in again as a tests gain and its showing fine. also when i go in the ACP i also see the settings have saved
can you tell me what browsers you are using so i can test it on the same browser?