With AIX 6.1, the behavior of your terminal may have changed:

• SMIT output may look strange and not readable during command execution
• Function keys do not work any more when working with putty
• After having viewed a file with more, the output disappears once more has finished.

A new TERMINFO file for the xterm is responsible for this new behavior. If you prefer the behavior until AIX 5.3, you can just copy the file /usr/share/lib/terminfo/x/xterm to your AIX 6.1 from any AIX 5.3 and everything stays better.

The AIX 6.1 differences guide states that the same behavior can be achieved if you choose the TERM variable to xterm-old, but this is not true.