Not sure if this was posted before or not, I did a search and could not find it.
For those using vBadvanced, if there is missing images due to the collapse buttons not showing, you can delete this line in
adv_portal_module_wrapper template under the Mobile style
Code:
<if condition="$vba_style['portal_collapsemods']">
<a href="#top" onclick="return toggle_collapse('module_$mods[collapse]')" style="float:$stylevar[right]"><img alt="" border="0" id="collapseimg_module_$mods[collapse]" src="$stylevar[imgdir_button]/collapse_tcat$modimgcollapse.gif" /></a>
</if>