<%# %> is not working now in any NEW aspx page

I am using <%# %> expressions a lot to set my Text property on a number of controls.  Now for some reason the code is not being fired in the .aspx pages. If we do it on the code behind it works fine. Has anyone ever seen this issue?  We are data binding from a static class in the Classes Folder on the UI root.
Example that is not working now.  On other pages that are ALREADY added to our solution and working... it works fine and hits the code behind function when we set a break point.
<asp:Label runat="server" ID="label1" CssClass="labelFieldCSS" Text='<%# UIHelper.MyFunction(Request.Path.ToString()) %>' ></asp:Label>