In my case I clicked on the 'Only users I accepted are allowed to contact me' button and this is what appeared on the log:
[15:56:33] save_config: saving config for user
rogdias@hotmail.com in D:/Documents and Settings/rdias/amsn/rogdias_hotmail_com]
[15:56:33] save_config: saving config_file. Opening of file returned : file4c183d8
[15:56:33] save_config: Config saved
[15:56:33] @@@@@@@@@@@@@@ DRAG AND DROP
[15:56:33] DP DND registered
[15:56:34] save_config: saving config for user
rogdias@hotmail.com in D:/Documents and Settings/rdias/amsn/rogdias_hotmail_com]
[15:56:34] save_config: saving config_file. Opening of file returned : file4069618
[15:56:34] save_config: Config saved
[15:56:34] @@@@@@@@@@@@@@ DRAG AND DROP
[15:56:34] DP DND registered
But the status of the button wasn't saved.
Cheers from Rio,
Roger