Hi, we're experiencing a strange issue one of  our our umbraco instances where the contour forms are not displaying (or sometimes displaying but throwing Pre-render error upon submit). Here's how the error appears

The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[HttpException (0x80004005): The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.]
   System.Web.UI.ControlCollection.RemoveAt(Int32 index) +206
   System.Web.UI.Control.AddedControl(Control control, Int32 index) +74
   umbraco.presentation.templateControls.Macro.CreateChildControls() +1911
   System.Web.UI.Control.EnsureChildControls() +181
   System.Web.UI.Control.InitRecursive(Control namingContainer) +819
   System.Web.UI.Control.AddedControl(Control control, Int32 index) +274
   umbraco.presentation.templateControls.<>c__DisplayClass4.<ParseMacros>b__2(String macroAlias, Dictionary`2 attributes) +516
   Umbraco.Core.Macros.MacroTagParser.ParseMacros(String text, Action`1 textFoundCallback, Action`2 macroFoundCallback) +819
   umbraco.presentation.templateControls.Item.OnLoad(EventArgs e) +33
   System.Web.UI.Control.LoadRecursive() +116
   System.Web.UI.Control.LoadRecursive() +206
   System.Web.UI.Control.LoadRecursive() +206
   System.Web.UI.Control.LoadRecursive() +206
   System.Web.UI.Control.LoadRecursive() +206
   System.Web.UI.Control.LoadRecursive() +206
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2809

Has anyone else seen this? There was an earlier bug that looked simimlar to this that was reported fixed in version 1.1.x and we are running 3.0.14 on Umbraco 4.11.10. 

Thanks all!