Nothing happens after entering a transaction code.

• Check $AEPATH.
• Check for aeenv file with trancode in $AEPATH.

When an application screen draws, it shifts or scrolls 1 or 2 lines.

• The terminal setup file is wrong. Add or modify the p3270keys to include the correct lines= entry for your terminal type.
• The terminal has a setup capability. Press the key sequence for setup and look for a scroll capability. If there is one that says jump, change it to smooth.