from a quick look at this i think its your ends fault

-> irc.mircx.com PRIVMSG XdccServerName :DCC RESUME "" 32774 20122584

should read

-> irc.mircx.com PRIVMSG XdccServerName :DCC RESUME file.ext 32774 20122584

Why yours is doing that i have no idea, i just tried on mine and it works fine. admittly v6.12