Getting an error when trying to create new user

We're running 4.0.7 build 3 (free version).

I'm trying to create a new user when logged in as the administrator. When I click the "Create User" button, I'm getting an IIS error with the following message in a pop-up window:

Server Error in '/' Application.
Unable to find control id 'txtPassword' referenced by the 'ControlToValidate' property of ''.
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: Unable to find control id 'txtPassword' referenced by the 'ControlToValidate' property of ''.

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): Unable to find control id 'txtPassword' referenced by the 'ControlToValidate' property of ''.]
System.Web.UI.WebControls.BaseValidator.CheckControlValidationProperty(String name, String propertyName) +12239964
System.Web.UI.WebControls.BaseValidator.ControlPropertiesValid() +109
System.Web.UI.WebControls.BaseValidator.OnPreRender(EventArgs e) +58
System.Web.UI.Control.PreRenderRecursiveInternal() +113
System.Web.UI.Control.PreRenderRecursiveInternal() +222
System.Web.UI.Control.PreRenderRecursiveInternal() +222
System.Web.UI.Control.PreRenderRecursiveInternal() +222
System.Web.UI.Control.PreRenderRecursiveInternal() +222
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4297

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34280

Product: ProGet
Version: 4.0.7

this should be resolved in ProGet 4.0.8.