css sometimes not loaded in IE8

[Khalid]

I have a website with telerik controls. I am using also the RadStyleSheet in my masterpage. Sometimes the website is loaded without css stylesheet but I dont know why. I know it occured in IE 8. I dont know how to reproduce this problem because sometimes it works OK and sometimes it dont work! This is the RadStyleSheetManager in my masterpage:

<telerik:RadStyleSheetManager ID="RadStyleSheetManager1" runat="server" EnableStyleSheetCombine="true"
        OutputCompression="AutoDetect">
        <StyleSheets>
            <telerik:StyleSheetReference Path="~/Styles/Site.css" />
            <telerik:StyleSheetReference Path="~/Styles/Handheld.css" />
            <telerik:StyleSheetReference Path="~/Styles/Skins/Button.css" />
            <telerik:StyleSheetReference Path="~/Styles/Skins/Grid.css" />
            <telerik:StyleSheetReference Path="~/Styles/Skins/Menu.css" />
            <telerik:StyleSheetReference Path="~/Styles/Skins/Window.css" />
            <telerik:StyleSheetReference Path="~/Styles/Skins/CTAC/Button.CTAC.css" />
            <telerik:StyleSheetReference Path="~/Styles/Skins/CTAC/Grid.CTAC.css" />
            <telerik:StyleSheetReference Path="~/Styles/Skins/CTAC/Menu.CTAC.css" />
            <telerik:StyleSheetReference Path="~/Styles/Skins/CTAC/Window.CTAC.css" />
        </StyleSheets>
    </telerik:RadStyleSheetManager>

Does someone know how I can fix this?

[Kate]

Hi Khalid,

Can you please provide a live url of your web site? Thus, it will enable us observe the issue locally and check what is causing the issue.

All the best,
Kate
the Telerik team

[Khalid]

I have removed the following 2 properties and now it is working:

EnableStyleSheetCombine="true" OutputCompression="AutoDetect"

Can someone explain why it is working now OK?