The apple laf isn't implemented correctly in java, causing notSerializableException when trying to save a profile. Try changing the skin to say metal and save profile.
I get a blank error message dialogue window when trying to connect.
Check the log files and see what error message was thrown further down in the exception stack. Usually this is because you have an old version of xmlrpc-c. read the installation guide on this.
Problem with large .torrent files? (XML-RPC request too large).
Suddenly have no torrents listed in nTorrent even though they exist in rTorrent.
You have a torrent file that isn't using UTF-8 encoding, you should add this too your .rtorrent.rc config file: encoding_list = UTF-8, this will force UTF-8 communcation over XMLRPC
nTorrent 0.5 fails to open in OSX 10.5.5 (Java 1.6 update installed)