Amaya 8.7 Windows XP bug: Undo and save

Hi,

In Amaya 8.7 for Windows XP, sometimes the save command and icon remain disabled after applying an undo command.

Steps to reproduce (it is just an example, this problem happens in other cases)
Write a paragraph, change it to h1, save the document, apply undo command (h1 is changed to p). The save icon and menu remain disabled.

Best regards,
Barto