Latest beta does not open at all

[Former user]

Instead of games, I get this error:

(Inner Exception)

At least one object must implement IComparable.

App: LaunchBox Version: 8.3-beta-7 Type: System.ArgumentException Site: Int32 Compare(System.Object, System.Object) Source: mscorlib

at System.Collections.Comparer.Compare(Object a, Object b) at System.Collections.Generic.ArraySortHelper1.SwapIfGreater(T[] keys, IComparer1 comparer, Int32 a, Int32 b) at System.Collections.Generic.ArraySortHelper1.DepthLimitedQuickSort(T[] keys, Int32 left, Int32 right, IComparer1 comparer, Int32 depthLimit) at System.Collections.Generic.ArraySortHelper1.Sort(T[] keys, Int32 index, Int32 length, IComparer1 comparer)

(Outer Exception)

Failed to compare two elements in the array.

App: LaunchBox Version: 8.3-beta-7 Type: System.InvalidOperationException Site: Void Sort(T[], Int32, Int32, System.Collections.Generic.IComparer`1[T]) Source: mscorlib

at System.Collections.Generic.ArraySortHelper1.Sort(T[] keys, Int32 index, Int32 length, IComparer1 comparer) at System.Array.Sort[T](T[] array, Int32 index, Int32 length, IComparer1 comparer) at System.Collections.Generic.List1.Sort(Int32 index, Int32 count, IComparer`1 comparer) at (NodeList ) at Unbroken.LaunchBox.Data.NodeList.GetSortedNodes(NodeList nodes) at (<>c__DisplayClass49_0 , Object ) at Unbroken.LaunchBox.Desktop.Next.ViewModels.SideBarViewModel.<>c__DisplayClass49_0.<PopulateValues>b__0(Object state) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem() at System.Threading.ThreadPoolWorkQueue.Dispatch()

Recent Log:

6:18:44 PM Exception