Borders in rich:table dissapear

[lenyas66]

I experienced strange problem recently. When my rich:table first appears on the screen, it has all borders shown correctly.

If I jump to another screen and return, it still has all the data in the table (I have bean-scope defined as session), but no longer has borders shown.

If I re-populate the table with data, borders show fine again.

Anybody has any ideas?

[ilya_shaikovsky]

show the code please.

[lenyas66]

<style>
.rich-list-shuttle-button-content {
 background-color: #84BBFF;
}
.rich-table-header {
 background-color: #FFFFFF;
 color: #000000;
}
</style>
...
<rich:dataTable value="#{piPerformanceReturnsBean.retData}" rowKeyVar="rKV"
 var="curPortBench" rendered="#{not empty piPerformanceReturnsBean.statistics}" >
 <!--
 -->
 <f:facet name="header">
 <rich:columnGroup>
 <rich:columnGroup>
 <rich:column>
 <h:outputText value="Product / Benchmark"></h:outputText>
 </rich:column>
 <rich:columns value="#{piPerformanceReturnsBean.statistics}" var="column"
 index="index" colspan="#{piPerformanceReturnsBean.trailingPeriodsLength}">
 <h:outputText value="#{column.displayName}"></h:outputText>
 </rich:columns>
 </rich:columnGroup>
 <rich:columnGroup>
 <rich:column>
 <rich:spacer/>
 </rich:column>
 <rich:columns value="#{piPerformanceReturnsBean.headerTimePeriods}" var="column"
 index="index" >
 <h:outputText value="#{column}"></h:outputText>
 </rich:columns>
 </rich:columnGroup>
 </rich:columnGroup>
 </f:facet>
 <rich:column id="portBenchName">
 <h:outputText value="#{piPerformanceReturnsBean.prodBenchNames[rKV]}"/>
 </rich:column>
 <rich:columns value="#{piPerformanceReturnsBean.headerTimePeriods}" var="column"
 index="index" style="text-align:center" >
 <h:outputText value="#{piPerformanceReturnsBean.retData[rKV][index]}">
 <f:converter converterId="DoubleConverter"/>
 </h:outputText>
 </rich:columns>
 </rich:dataTable>