Rig Manager 3.4.28 won't start - Windows 11

  • I updated Rig Manager from 3.3.50 to 3.4.28. Install went without any error. My Profiler runs OS 9 beta.

    Now Rig Manager won't start anymore. After start it will load some things and then shows the following error message:

    The debuglog.txt says:

    ------------- session start 2023-05-18 13:01:17------------------

    3.4.28.1

    Windows 11.0 Build 23451 de-DE

    0|UPM XML parsing error 2: Line 1, Col 1: tag or eof expected, illegal character

    73|UPM XML parsing error 2: Line 1, Col 1: tag or eof expected, illegal character

    75|UPM XML parsing error 2: Line 1, Col 1: tag or eof expected, illegal character

    51|UPM XML parsing error 2: Line 1, Col 1: tag or eof expected, illegal character

    5|Location added: Local Library

    9|Location added: Local Library

    371|Location added: Local Library

    5|Location added: Rig Packs

    274|Location added: Preset Packs

    38|!!!Exception!!!

    4|Der Typ "KemperControlLibrary.LayoutPanel" in der Assembly "KemperControlLibrary, Version=3.3.3.1, Culture=neutral, PublicKeyToken=null" konnte nicht geladen werden.

    3| bei ProfilerControlCenter.FormMain.InitializeComponent()

    bei ProfilerControlCenter.FormMain..ctor(WinApp* app, list<Access::MetaCollection \*\,std::allocator<Access::MetaCollection \*> >* metaCollections, Collection* currentCollection)

    bei Access.WinApp.OnApplicationMessage(WinApp* , UInt32 message, Int64 param1, Int64 param2)

    bei Access.Application.WinProc(HWND__* hwnd, UInt32 msg, UInt64 wp, Int64 lp)

    bei System.Windows.Forms.UnsafeNativeMethods.DispatchMessageA(MSG& msg)

    bei System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)

    bei System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)

    bei System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)

    bei Access.Application.Run(Application* , Int32 argc, SByte** argv)

    bei Launch()

    33|FileUpdater XML parsing error 2: Line 1, Col 1: tag or eof expected, illegal character

    74|FileUpdater XML parsing error 2: Line 1, Col 1: tag or eof expected, illegal character

    ------------------ closing application -------------------

    Any ideas?