Had some problems in IE9 with a VF page being called from a modal popup (works fine in all other browsers). The problem is when I clicked my NEXT button to re-render the page (see example below), it popped up a NEW window (so I now have 2 pop up windows open) instead of re-rendering . 

Anyway, when debugging this, I found it was much worse (the page wasn't working at all in IE) so built the following test page to test it with very simple code:

<apex:pagecontroller="TestIE"  title="Test IE 2x Pages">

<apex:form>

<apex:pageBlockrendered="{!ShowPage2=false}">

PAGE1<br/>

        <apex:outputTextstyleclass="labelCol">Value ($US)</apex:outputText>

        <apex:InputTextid="Value"value="{!DollarValueString}"/>  

</apex:pageBlock>

<apex:pageBlockrendered="{!ShowPage2=true}">

PAGE2<br/>

        <apex:outputTextstyleclass="labelCol">The Name</apex:outputText>

        <apex:InputTextid="TheName"value="{!TheName}"/>  

</apex:pageBlock>

<apex:commandButtonvalue="Next"action="{!ShowPageTwo}"rendered="{!ShowPage2==false}"/>

</apex:form>

</apex:page>

then my controller code : 

publicwithsharingclass TestIE {

public String TheName{get;set;}

public String DollarValueString{get;set;}

public Boolean ShowPage2 {get;set;}

// Test Init

public TestIE()

{

TheName = 'Example Name';

DollarValueString = '999';

ShowPage2 = false;

} // end init

// *********************************************

// *********** Switch To Next Page *************

// *********************************************

public PageReference ShowPageTwo()

{

ShowPage2 = true;

returnnull;

} // end method

} // end class

Didn't seem as though I could make that much simpler? Its just 2 screens which change when you click "NEXT".  It works fine in all browsers (I am on Winter13 in a sandbox by the way) but in IE the NEXT button does nothing and when I checked I have a number of JS errors!

SCRIPT16385: Not implemented

SfdcCore.js, line 71 character 160
SCRIPT5009: 'Sfdc' is undefined
VFState.js, line 1 character 1
SCRIPT16385: Not implemented

main.js, line 944 character 160
SCRIPT438: Object doesn't support property or method 'hook_isAccessibleMode'
main.js, line 431 character 71
SCRIPT438: Object doesn't support property or method 'hook_isAccessibleMode'
main.js, line 431 character 71
SCRIPT5009: 'Sfdc' is undefined
main.js, line 998 character 35
SCRIPT5009: 'Sfdc' is undefined
testie, line 85 character 1
SCRIPT5009: 'SfdcApp' is undefined
main.js, line 197 character 174

I know using IE is asking for trouble but I would have thought standard VF would be ok (the client has it as standard so I need to make it work in IE). ? 

Anyone have any suggestions on what the JS errors are and what is wrong with my nice and simple page? Second question I guess is why the new popup window opens but I guess I need to sort the above issue first. Thanks in advance.