Just upgraded from 1.2 alpha to 1.2 rc1.
The grid now has a height of 0 (also navbar and header).
The blocks have a height of 33.
<header class="ui-header ui-bar-a" data-theme="a" data-role="header" role="banner">
<div class="ui-navbar ui-mini" data-role="navbar" role="navigation">
<a id="divViewBtn" class="ui-btn ui-btn-inline ui-btn-active ui-btn-up-a" data-corners="false" data-shadow="false" data-iconshadow="true" data-wrapperels="span" data-theme="a" data-inline="true">
</li>
<a class="link ui-btn ui-btn-up-a ui-btn-inline" onclick="showListEdit();" data-corners="false" data-shadow="false" data-iconshadow="true" data-wrapperels="span" data-theme="a" data-inline="true">
</li>
<a class="link ui-btn ui-btn-up-a ui-btn-inline" onclick="showListMap();" data-corners="false" data-shadow="false" data-iconshadow="true" data-wrapperels="span" data-theme="a" data-inline="true">
</li>
</ul>
</div>
</header>