Update: A newer version 6.3.5.7 is now available with a minor improvement.
Version 6.3.5.6:
Quick editor fix: We just discovered a problem in the previous version, 6.3.5.5, where occasionally, the Enter key stopped working in Quick Editor so that the line feeds could not be entered. This problem only occurred in “Tabbed pages” mode. A workaround was to switch to Main Document List and back.
Now, we have fixed this problem in version 6.3.5.6.