Created new Dashboard, cannot click Home

created a new dashboard and made it available to Web Desk but am now getting the following error when clicking "Home"

at System.Collections.Generic.Dictionary`2.get_Item(TKey key)

at Touchpaper.Framework.SystemServices.PreferenceCache.DashboardCache.GetDashboards(ISessionDetails session) in C:\Dev\TPS Code Latest\Source\Touchpaper\Framework\Touchpaper.Framework.SystemServices.PreferenceCache\DashboardCache.cs:line 255

at Touchpaper.Web.Console.Controllers.DashboardController.FindDashboard(Guid guid) in c:\Dev\swa\code\Touchpaper.Web.Console\Controllers\DashboardController.cs:line 266

at Touchpaper.Web.Console.Controllers.DashboardController.Open(Boolean isHome) in c:\Dev\swa\code\Touchpaper.Web.Console\Controllers\DashboardController.cs:line 55

at Touchpaper.Web.Console.Controllers.DashboardController.OpenHomeDashboard() in c:\Dev\swa\code\Touchpaper.Web.Console\Controllers\DashboardController.cs:line 40

at lambda_method(Closure , ControllerBase , Object[] )

at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)

at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)

at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClassd.b__a()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)