Calenar popup in modal panels in Opera 9 is diplayed initially.
+
<rich:calendar id="cs" style="width:150px" popup="true" value="#{bean.cs}"/>
<td><div id="task:cs" style="z-index: #{ component . attributes [ 'zindex' ]" style="width:150px"> ....
Henady,
there was a bug in 3.1.0 release. I'ts already fixed.
Please check out latest snapshot for fix.