I'm upgrading from 2.2 to 2.3 but the page "freeze" during step 2 - "system checking" with the yellow bar near the left side of the entire bar. I tried so view the "page source", the result is:
</td>
<td class="main">
<div id="MainPageStatus_statusBlock">
<p>
<h3> <span id="MainPageStatus_title"> </span> </h3>
</p>
<p>
<h4><span id="MainPageStatus_description"> </span></h4>
</p>
<table id="statusTable" cellspacing="0">
<tr>
<td id="MainPageStatus_progressMade" class="progressMade"> </td>
<td id="MainPageStatus_progressToGo" class="progressToGo"> </td>
</tr>
</table>
</div>
<script type="text/javascript">
//
and nothing else...