Sounds like a PHP configuration issue. Some hosts won’t allow fopen() on remote URLs (it won’t let you go outside your own server for files); you may or may not have the "curl" libraries available, or some other reason why you can’t access anything outside your own site.
You can remove these tabs by commenting out the sections in /manager/actions/welcome.static.php between lines 69 and 83; they are well-commented:
/* Start comment
include_once "rss.inc.php"; // pixelchutes
// modx news - pixelchutes
$html = 'MODx News<br /><br />';
$modx->setPlaceholder('modx_news','MODx News');
$modx->setPlaceholder('modx_news_title','MODx News');
$modx->setPlaceholder('modx_news_content',$feedData['modx_news_content']);
// security notices - pixelchutes
$html = 'MODx Security Notices<br /><br />';
$modx->setPlaceholder('modx_security_notices','Security Notices');
$modx->setPlaceholder('modx_security_notices_title','MODx Security Notices');
$modx->setPlaceholder('modx_security_notices_content',$feedData['modx_security_notices_content']);
End comment */
Then remove the (now empty) tabs in manager/media/style/MODxLight/welcome.html simply by removing the HTML close comment tags for the two tabs on lines 78 and 87:
<!-- modx news
<div class="tab-page" id="tabNews" style="padding-left:0px; padding-right:0px">
<h2 class="tab">[+modx_news+]</h2>
<script type="text/javascript">tpPane.addTabPage( document.getElementById( "tabNews" ) );</script>
<div class="sectionHeader">[+modx_news_title+]</div><div class="sectionBody">
[+modx_news_content+]
</div>
</div>
<!-- security notices
<div class="tab-page" id="tabSecurityNotices" style="padding-left:0px; padding-right:0px">
<h2 class="tab">[+modx_security_notices+]</h2>
<script type="text/javascript">tpPane.addTabPage( document.getElementById( "tabSecurityNotices" ) );</script>
<div class="sectionHeader">[+modx_security_notices_title+]</div><div class="sectionBody">
[+modx_security_notices_content+]
</div>
</div>
<!-- recent activities -->
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