Hi,

Below is my vf page. I have used action function control and java script to call controller method. When I have created this page, it was working perfactly. But today it is not working, I am not able to find any reason for that. If I use action in commandbutton directly then it works fine (that means my controller works fine). But as per my requirement I have to call that action using action function as this is a popup page.

<apex:page id="pg" controller="GeneralSettingsController" sidebar="false" showHeader="false">
    <apex:pageMessages id="msg"/>
    <apex:form id="frm">
        <apex:PageBlock id="pb">
            <apex:pageBlockButtons >
                <apex:commandButton value="Save Settings" onclick="SaveSettings();"/>
                <apex:commandButton value="Cancel" onclick="window.close();"/>
            </apex:pageBlockButtons>
            Save Status: <B>{!saveStatus}</B><BR/><BR/>
            Remove chat history prior to &nbsp;&nbsp;<apex:inputField style="width:30px" value="{!objSetting.Time_Digit__c}"/>&nbsp;&nbsp;
            <apex:selectList style="width:75px" size="1" multiselect="false" value="{!objSetting.Time_Unit__c}">
                <apex:selectOption itemValue="Minutes" itemLabel="Minutes"/>
                <apex:selectOption itemValue="Hours" itemLabel="Hours"/>
                <apex:selectOption itemValue="Days" itemLabel="Days"/>
            </apex:selectList>
            
        </apex:PageBlock>
        <apex:actionFunction oncomplete="window.close();" id="afSaveSettingValues" name="SaveSettingValues" action="{!SaveSettings}"/>
    </apex:form>
    
    <script>
        function SaveSettings(){
            pg:frm:SaveSettingValues();
        }
    </script>
</apex:page>

 Please give me some suggestion to find out cause.