Here's the debug log.
<E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent"><System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system"><EventID>0</EventID><Type>3</Type><SubType Name="Start">0</SubType><Level>255</Level><TimeCreated SystemTime="2013-06-21T05:54:23.4514985Z" /><Source Name="Boxcryptor" /><Correlation ActivityID="{41ea24d5-2fac-4841-af25-1ca376229bad}" /><Execution ProcessName="Boxcryptor" ProcessID="2776" ThreadID="1" /><Channel/><Computer>MachineName</Computer></System><ApplicationData>BoxCyptorMain.CreateShareReciever</ApplicationData></E2ETraceEvent><E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent"><System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system"><EventID>0</EventID><Type>3</Type><SubType Name="Stop">0</SubType><Level>255</Level><TimeCreated SystemTime="2013-06-21T05:54:23.4585013Z" /><Source Name="Boxcryptor" /><Correlation ActivityID="{41ea24d5-2fac-4841-af25-1ca376229bad}" /><Execution ProcessName="Boxcryptor" ProcessID="2776" ThreadID="1" /><Channel/><Computer>MachineName</Computer></System><ApplicationData>BoxCyptorMain.CreateShareReciever</ApplicationData></E2ETraceEvent><E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent"><System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system"><EventID>0</EventID><Type>3</Type><SubType Name="Error">0</SubType><Level>2</Level><TimeCreated SystemTime="2013-06-21T05:54:23.4605021Z" /><Source Name="Boxcryptor" /><Correlation ActivityID="{41ea24d5-2fac-4841-af25-1ca376229bad}" /><Execution ProcessName="Boxcryptor" ProcessID="2776" ThreadID="1" /><Channel/><Computer>MachineName</Computer></System><ApplicationData>System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
Server stack trace:
bei Boxcryptor.UserInterface.BoxcryptorMain.#=qTbwUPeN3pLP90vmQSquH16vdH_6LwwLpOOsGJtHFqxo=()
bei Boxcryptor.UserInterface.BoxcryptorMain.#=qCHD$6Ug5w854NnWX40Fw7wxRR99unzJp5kovmuUeOTM=.MoveNext()
Exception rethrown at [0]:
bei System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__0(Object state)
bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
bei MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)</ApplicationData></E2ETraceEvent><E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent"><System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system"><EventID>0</EventID><Type>3</Type><SubType Name="Error">0</SubType><Level>2</Level><TimeCreated SystemTime="2013-06-21T05:54:23.4655041Z" /><Source Name="Boxcryptor" /><Correlation ActivityID="{00000000-0000-0000-0000-000000000000}" /><Execution ProcessName="Boxcryptor" ProcessID="2776" ThreadID="1" /><Channel/><Computer>MachineName</Computer></System><ApplicationData>System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
bei Boxcryptor.UserInterface.BoxcryptorMain.ShowBalloonTip(Int32 timeout, String tipTitle, String tipText, ToolTipIcon tipIcon, #=qkw0utjY6gUpwBuybLwDNkA== onClickDelegate)
bei Boxcryptor.UserInterface.BoxcryptorMain.#=qqSAl8GYZsuluHmBB5V_xVKLC9x0yoktPj_QaUvyFim4=(Object #=qt9za$kYcSgzgYh$AZp5XPA==, DispatcherUnhandledExceptionEventArgs #=qXCqOWQ0SfC5tBeYZ_7oNnw==)
bei System.Windows.Threading.Dispatcher.CatchException(Exception e)
bei System.Windows.Threading.Dispatcher.CatchExceptionStatic(Object source, Exception e)
bei System.Windows.Threading.ExceptionWrapper.CatchException(Object source, Exception e, Delegate catchHandler)
bei MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.DispatcherOperation.InvokeImpl()
bei System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
bei System.Threading.ExecutionContext.runTryCode(Object userData)
bei System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
bei System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
bei System.Windows.Threading.DispatcherOperation.Invoke()
bei System.Windows.Threading.Dispatcher.ProcessQueue()
bei System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
bei MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)</ApplicationData></E2ETraceEvent><E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent"><System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system"><EventID>0</EventID><Type>3</Type><SubType Name="Error">0</SubType><Level>2</Level><TimeCreated SystemTime="2013-06-21T05:54:23.4665045Z" /><Source Name="Boxcryptor" /><Correlation ActivityID="{00000000-0000-0000-0000-000000000000}" /><Execution ProcessName="Boxcryptor" ProcessID="2776" ThreadID="1" /><Channel/><Computer>MachineName</Computer></System><ApplicationData>System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
bei Boxcryptor.UserInterface.BoxcryptorMain.ShowBalloonTip(Int32 timeout, String tipTitle, String tipText, ToolTipIcon tipIcon, #=qkw0utjY6gUpwBuybLwDNkA== onClickDelegate)
bei Boxcryptor.UserInterface.BoxcryptorMain.#=qqSAl8GYZsuluHmBB5V_xVKLC9x0yoktPj_QaUvyFim4=(Object #=qt9za$kYcSgzgYh$AZp5XPA==, DispatcherUnhandledExceptionEventArgs #=qXCqOWQ0SfC5tBeYZ_7oNnw==)
bei System.Windows.Threading.Dispatcher.CatchException(Exception e)
bei System.Windows.Threading.Dispatcher.CatchExceptionStatic(Object source, Exception e)
bei System.Windows.Threading.ExceptionWrapper.CatchException(Object source, Exception e, Delegate catchHandler)
bei MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
bei MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
bei MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
bei System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
bei System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
bei System.Windows.Application.RunDispatcher(Object ignore)
bei System.Windows.Application.RunInternal(Window window)
bei System.Windows.Application.Run(Window window)
bei Boxcryptor.UserInterface.App.Main()</ApplicationData></E2ETraceEvent>
