I tried this. Adding translate (yours), removing, adding again (the same and different) and did not have problems. Can you send your translate commands your trying and the output. Below is my test.
3600-2#show translate
Translate From: TCP 32.83.178.18 Port 5557
To: AUTOCOMMAND "telnet 128.212.96.30 23"
0/0 users active, 0 peak, 0 total, 0 failures
3600-2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
3600-2(config)#no translate tcp 32.83.178.18 port 5557 autocommand "telnet 128$
3600-2(config)#
3600-2#sh translate
3600-2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
3600-2(config)#$78.18 port 5557 autocommand "telnet 128.212.96.30 23"
3600-2(config)#
3600-2#
1d07h: %SYS-5-CONFIG_I: Configured from console by console
3600-2#sh translate
Translate From: TCP 32.83.178.18 Port 5557
To: AUTOCOMMAND "telnet 128.212.96.30 23"
0/0 users active, 0 peak, 0 total, 0 failures
Also able to remote the translate and add using different port.
3600-2#show translate
Translate From: TCP 32.83.178.18 Port 5558
To: AUTOCOMMAND "telnet 128.212.96.30 23"
0/0 users active, 0 peak, 0 total, 0 failures
Hope this helps you,
Don