01-06-2010 10:52 AM
This can be caused by a corrupted ACT! Preference file or incorrect DPI (dots per inch) settings. You can resolve this by deleting the Preference file and ACT! will rebuild this file the next time you launch the program or by changing the DPI settings for your monitor.
See this KB Article
Go to the section titled "Attempting to Open the Layout Designer or Switching Between Layouts"