same thing happens to me, with the most recent versions (including the latest
update, but was present 1-3 versions before too)

(viz https://i.ibb.co/2jk130r/image.png ) (viz https://imgbb.com/ )


Exception class: EAccessViolation
Exception address: 000000000052F0F5
--------------------------------------------------------------------------------
--------------------
Stack list, generated 20. 4. 2021 16:24:30
[000000000052F0F5] System.Classes.TList.Last + $15
[0000000000863B58] JclDebug.JclCreateStackList (Line 5308, "JclDebug.pas" + 1) +
$3F
[0000000000863AC6] JclDebug.DoExceptionStackTrace (Line 5249, "JclDebug.pas" +
20) + $15
[00000000008654B2] JclDebug.DoExceptNotify (Line 6276, "JclDebug.pas" + 7) + $0
[0000000000853955] JclHookExcept.TNotifierItem.DoNotify (Line 272,
"JclHookExcept.pas" + 5) + $11
[0000000000853B9B] JclHookExcept.DoExceptNotify (Line 339, "JclHookExcept.pas" +
13) + $2B
[0000000000853D57] JclHookExcept.HookedExceptObjProc (Line 395,
"JclHookExcept.pas" + 5) + $0
[000000000041139E] System.@DelphiExceptionHandler + $26E
[00007FFEBD511F6F] Unknown function at __chkstk + $11F
[00007FFEBD4C1454] RtlRaiseException + $434
[00007FFEBD510A9E] KiUserExceptionDispatcher + $2E
[000000000052F0F5] System.Classes.TList.Last + $15
[00000000008D618E] SynEdit.TCustomSynEdit.SetFocus (Line 8743, "SynEdit.pas" +
3) + $8
[0000000000AEAAEB] uChildParent.TfChildParent.TakeFocus (Line 1128,
"uChildParent.pas" + 24) + $18
[0000000000AEA2E4] uChildParent.TfChildParent.WMSysCommand (Line 941,
"uChildParent.pas" + 48) + $19
[000000000040FEF5] System.TObject.Dispatch + $45
[00000000007FAC40] Vcl.Controls.TControl.WndProc + $370
[0000000000801EA0] Vcl.Controls.TWinControl.WndProc + $9A0
[00000000007A7C4E] Vcl.Forms.TCustomForm.WndProc + $99E
[000000000080101C] Vcl.Controls.TWinControl.MainWndProc + $2C
[00000000005561B6] System.Classes.StdWndProc + $26
[00007FFEBC1DE858] Unknown function at CallWindowProcW + $3F8
[00007FFEBC1DDE1B] Unknown function at SendMessageW + $86B
[00007FFEBC1DD68A] SendMessageW + $DA
[00007FFEBC247D94] TranslateMDISysAccel + $F4
[00000000007B5F50] Vcl.Forms.TApplication.IsMDIMsg + $50
[00000000007B637C] Vcl.Forms.TApplication.ProcessMessage + $FC
[00000000007B6428] Vcl.Forms.TApplication.HandleMessage + $18
[00000000007B6876] Vcl.Forms.TApplication.Run + $E6
[0000000000D8E3BC] PSPad.PSPad (Line 121, "" + 56) + $0
[00007FFEBD2D7034] BaseThreadInitThunk + $14
[00007FFEBD4C2651] RtlUserThreadStart + $21
--------------------------------------------------------------------------------
--------------------
Program  : C:\programs\pspad\PSPad.exe  5.0.6 (589)
System   : Windows 10 Professional x64, Version: 10.0, Build: 4A61, 
Processor: Intel, Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz, 2400 MHz MMX
Display  : 1600x900 pixels, 32 bpp PPI: 96
Skin     : Windows
--------------------------------------------------------------------------------
--------------------
Active Controls Hierarchy:
TPSSynEdit "FEditor1"
TfChildEdit "fEdit_L09232790"
--------------------------------------------------------------------------------
--------------------


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