Thanks, that worked fine and upgraded to: 14.0.1.406
Unfortunately, that did not help.
I found out the problem: this happens when the firewall blocks Framemaker.
The part that was displayed is the right part of the welcome.html file with the links that were blocked.
This might be construed as a bug: FM should be able to display correctly the left of the start page where there is no Internet connection.
I guess that editing the welcome file to remove the live part could solve the problem, but I don't know how to do that.
Edit: I found how to edit the file, and now it works without Internet connection if needed.
Here is the new welcome.html file in case somebody needs it:
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" href="styles.css">
<script language="javascript" src="script.js"></script>
</head>
<body id="main" oncontextmenu="return false">
<table id="content">
<tr id="header">
<td colspan="3">
<img id="appLogo" alt="" src="images/fm_13_app_RGB.svg"/>
<h1 id="appName">Adobe FrameMaker</h1>
</td>
</tr>
<tr>
<td id="col_open">
<div class="tdwrapper">
<div id="recents">
<div>
<h2 class="unipad_l unipad_t">Recent Items</h2>
<h4 class="unipad_l">Files</h4>
<div id="fmRecentDocList"></div>
</div>
<div>
<h4 class="unipad_l unipad_t">Remote Repositories</h4>
<div id="fmRecentCMSList"></div>
</div>
</div>
<div id="openingActions">
<div class="unipad_t unipad_l unipad_r">
<a id="browse" href="http://fm-welcomescreen/?cmd=open-Files" class="button" title="Browse...">Browse... Ctrl+O</a>
<a id="connectRepository" href="http://fm-welcomescreen/?cmd=create-cms-connection" class="button quiet secondary" title="Connect to a Repository...">Connect to a Repository...</a>
</div>
<a id="restoreSession" href="http://fm-welcomescreen/?cmd=restore-last-session" class="button tertiary" title="Restore Last Session">Restore Last Session</a>
</div>
</div>
</td>
<td id="col_create">
<div class="tdwrapper">
<h2 class="unipad_l unipad_t unipad_b">Create a New Document</h2>
<div id="templatesList">
<div id="fmStructuredSection" class="clear unipad_l unipad_r unipad_b">
<br/>
<h3>XML</h3>
<h5><span id="DITA_Standard">(DITA-1.2)</span> <a id="FM_DITA_OPTIONS" href="http://fm-welcomescreen/?cmd=newxml-dita-options" class="">Change DITA Version</a></h5>
<div class="tileContainer clearfix">
<div id="fmNewXmlRecentList"></div>
<a href="http://fm-welcomescreen/?cmd=newxml-dita-topic" class="createTile XMLDitaTopic" title="Topic">Topic</a>
<a href="http://fm-welcomescreen/?cmd=newxml-dita-task" class="createTile XMLDitaTask" title="Task">Task</a>
<a href="http://fm-welcomescreen/?cmd=newxml-dita-concept" class="createTile XMLDitaConcept" title="Concept">Concept</a>
<a href="http://fm-welcomescreen/?cmd=newxml-dita-reference" class="createTile XMLDitaReference" title="Reference">Reference</a>
<!--<a href="http://fm-welcomescreen/?cmd=newxml-dita-glossentry" class="createTile XMLDitaReference" title="Glossentry">Glossentry</a>-->
<a href="http://fm-welcomescreen/?cmd=newxml-dita-map" class="createTile XMLDitamap" title="Map">Map</a>
<a href="http://fm-welcomescreen/?cmd=newxml-dita-bookmap" class="createTile XMLBookmap" title="Bookmap">Bookmap</a>
<a href="http://fm-welcomescreen/?cmd=newxml-xdocbook" class="createTile XMLXDocBook" title="xDocBook">xDocBook</a>
<a href="http://fm-welcomescreen/?cmd=newxml" class="createTile basicBrowse" title="Other XML...">Other XML...</a>
</div>
</div>
<div class="clear unipad_l unipad_r unipad_b">
<h3>FrameMaker</h3>
<div class="tileContainer clearfix">
<a href="http://fm-welcomescreen/?cmd=newdocument-portrait" class="createTile basicPortrait" title="Portrait">Portrait</a>
<a href="http://fm-welcomescreen/?cmd=newdocument-landscape" class="createTile basicLandscape" title="Landscape">Landscape</a>
<a href="http://fm-welcomescreen/?cmd=newdocument-custom" class="createTile basicCustom" title="Custom">Custom</a>
<a href="http://fm-welcomescreen/?cmd=newproject" class="createTile basicBook" title="Project">Project</a>
<a href="http://fm-welcomescreen/?cmd=newbook" class="createTile basicBook" title="Book">Book</a>
<a href="http://fm-welcomescreen/?cmd=newdocument-standard" class="createTile basicStandardTemplate" title="Standard Template...">Standard Template...</a>
<a id="fmStructuredTemplate" href="http://fm-welcomescreen/?cmd=newdocument-structured" class="createTile basicStructuredTemplate" title="Structured Template...">Structured Template...</a>
<a href="http://fm-welcomescreen/?cmd=newdocument-browse-template" class="createTile basicBrowse" title="New File from Template...">New File from Template...</a>
</div>
</div>
</div>
</div>
</td>
</tr>
</table>
</body>
</html>