Known problems are:

• "Alt+Tab" behavior.
  I don't understand what's happening!!!
  Fixed for release of version 3.1

 
• Development language tree displays nothing when there is only one section inside the .lng file.
  Solution is to create several sections to get several nodes (even if sections are empty)

 
• Problem with printed documents. Long lines are truncated !

 
• HAPedit has not documentation, except for this site (and the downloadable pages).

See also: Bug Report