Hi, when I change a product's category uCommerce/umbraco runs into an exception.

The setup:
uCommerce > stores > myStore >
 - Catelog 1 > category a, category b, category c
 - Catelog 2 > category a, category b
 - Catelog 3 > category a, category b, category c

To reproduce:
Open one of the products, go to the tab categories, add the product to another category by checking the appropiate checkbox.

The exception:

Server Error in '/' Application.

---

A potentially dangerous Request.Form value was detected from the client (ctl00$ctl12$Long Description="
In het Dynamisch ...").Description: ASP.NET has detected data in the request that is potentially dangerous because it might include HTML markup or script. The data might represent an attempt to compromise the security of your application, such as a cross-site scripting attack. If this type of input is appropriate in your application, you can include code in a web page to explicitly allow it. For more information, see http://go.microsoft.com/fwlink/?LinkID=212874. ;

Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (ctl00$ctl12$Long Description="
In het Dynamisch ...").

Source Error: 
[No relevant source lines]






Source File: c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\85ab859a\18f62108\App_Web_editproduct.aspx.2a84e035.h_8rsd6e.0.cs    Line: 0 

Stack Trace: 







[HttpRequestValidationException (0x80004005): A potentially dangerous Request.Form value was detected from the client (ctl00$ctl12$Long Description="
In het Dynamisch ...").]
   System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection) +12606049
   System.Web.HttpRequest.ValidateHttpValueCollection(HttpValueCollection collection, RequestValidationSource requestCollection) +132
   System.Web.HttpRequest.get_HasForm() +12608898
   System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +146
   System.Web.UI.Page.DeterminePostBackMode() +129
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +12575175
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +12574685
   System.Web.UI.Page.ProcessRequest() +119
   System.Web.UI.Page.ProcessRequest(HttpContext context) +99
   ASP.umbraco_ucommerce_catalog_editproduct_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\85ab859a\18f62108\App_Web_editproduct.aspx.2a84e035.h_8rsd6e.0.cs:0
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +913
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165