This is still a show stopper.
More information. After the browser window popup shown above, the control renders but has an error on its surface as shown below.
Again, this all ONLY happens in deployment.
The sample will show you the structure but unfortunately does not illustrate this behaviour.
Surely these errors can give a clue where to look?
Server Error in '/TM' Application.
The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
Requested URL: /tm/Component.form1.0.1084.ASCXHost.wgx
Version Information: Microsoft .NET Framework Version:2.0.50727.1434; ASP.NET Version:2.0.50727.1434