Well that's pretty poor of 1Passwd ... personally I would complain to the developer : yes, Yummy uses Carbon and yes, there is v2 (a complete rewrite) in the works, but all those apps and of course Yummy FTP are supported by the OS, even the upcoming 10.9, so for the developers to eliminate a few lines of code (no exaggeration!) at this point is premature, and only serves to inconvenience their own users.