MT4 crashes on startup. Is this due to corrupt system lock???

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My MT4 recently crashed while reorganizing profiles. From then on it keeps crashing on startup. Clean reinstall did not help (after uninstalling manually deleted installation folder in Program Files, Roaming/MetaQuotes, Virtualfolder, registry) resolve the issue. Looking at the crash log it looks like MT4 is trying to acquire system lock but fails due to NULL. My guess is it is due to some corrupt lock file or SID. Attached MT4 crash log below. Any suggestions please?

              767E3358:000012 [767E336A] AcquireSRWLockExclusive (kernel32.dll)
              77089F0F:000063 [77089F72] RtlInsertElementGenericTableAvl (ntdll.dll)
              77089F0F:000036 [77089F45] RtlInsertElementGenericTableAvl (ntdll.dll)

              770722C0 8BFF              mov        edi, edi
              770722C2 55                push       ebp
              770722C3 8BEC              mov        ebp, esp
              770722C5 83EC0C            sub        esp, 0xc
              770722C8 56                push       esi
              770722C9 57                push       edi
              770722CA 8B7D08            mov        edi, [ebp+0x8]
              770722CD 8D7704            lea        esi, [edi+0x4]
              770722D0 8BC6              mov        eax, esi
   crash -->  770722D2 F00FBA3000        lock btr        dword [eax], 0x0
              770722D7 0F839E020100      jae        dword 0x7708257b
              770722DD 64A118000000      mov        eax, [fs:0x18]
              770722E3 8B4824            mov        ecx, [eax+0x24]
              770722E6 894F0C            mov        [edi+0xc], ecx
              770722E9 C7470801000000    mov        dword [edi+0x8], 0x1
              770722F0 5F                pop        edi
 
kedar:

My MT4 recently crashed while reorganizing profiles. From then on it keeps crashing on startup. Clean reinstall did not help (after uninstalling manually deleted installation folder in Program Files, Roaming/MetaQuotes, Virtualfolder, registry) resolve the issue. Looking at the crash log it looks like MT4 is trying to acquire system lock but fails due to NULL. My guess is it is due to some corrupt lock file or SID. Attached MT4 crash log below. Any suggestions please?

Be patient.
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