Recurring Event from Custom List Definition Will Not Save

I have a custom list definition I am deploying from Visual Studio.  It is based on the Event content type.

When it is deployed to a site, it will allow my to create single events without any problems.

However, when I create and event and use the recurrance options it will not work.  I tick to use recurrance, fill in what I want (for example, repeat daily, for 10 times).  When I then save the form, I get the following error:

"Value does not fall within the expected range."

The stacktrace it provides is:

[ArgumentException: Value does not fall within the expected range.]
   Microsoft.SharePoint.WebControls.RecurrenceField.SetRecurrenceFields() +2900
   Microsoft.SharePoint.WebControls.RecurrenceField.CompleteItemLoad() +84
   Microsoft.SharePoint.Applications.GroupBoard.WebControls.OverbookField.BuildSPItem() +302
   Microsoft.SharePoint.Applications.GroupBoard.WebControls.OverbookField.IsOverbook() +29
   Microsoft.SharePoint.Applications.GroupBoard.WebControls.OverbookField.Validate() +132
   System.Web.UI.Page.Validate() +280
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +116
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3586

Up to this point I have not customised anything - no extra fields, forms.  Just a list definition and instance, based on the "Event" type.

What might be wrong?

Thanks for any help,

Richard