Check Syntax alpha-renaming does not work with `define-struct'.

After breaking a long interaction several times, one of the breaks
  may carry over to the next interaction.

The yellow execute warning in the interactions window does not go away
  if the user undoes all changes to the defintions window.

Backup files don't preserve file permissions.

Standalone executables do not support files with images (or
any kind of graphical syntax).

For a more complete listing of known bugs, see our
<a href="http://bugs.plt-scheme.org/query/">
online bug report database</a>