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gerry_2, you asked if this new file resolves also the problem with html special characters in backend.php.
xoops/backend.php
And it appears that the problem persists, as you mentioned. However, xoops/modules/news/ itself looks okay.
And I discovered another problem in exploring what you mentioned. In XOOPS 2.4.5 beta with News 1.66, all of the >> or << javascript links in the left sidebar of the admin control panel
xoops/modules/system/admin.php?fct=modulesadmin
do NOT work. (It's working on my XOOPS 2.3.3 production site.)