My replies to the original post keep disappearing for some reason so I'm re-posting in the hope that this will appear.
Mike suggested the following resolution which hasn't worked - https://community.atlassian.com/t5/Sourcetree-questions/SourceTree-has-stopped-working/qaq-p/592613#M14880
I updated .NET from 15.9.12 to 15.9.15 (VS 2017) and tried reinstalling SourceTree but this made no difference ie splash screen still hanging and same errors in Event Viewer.
There was no 'Bugsplat' dialogue but there was a link to a file called report.wer in the Event Viewer which I've posted below.
I've checked WMI and it is listed as ‘not found’.
I'm also getting a similar response when I do a winmgmt /verifyrepository:
C:\windows\system32>winmgmt /verifyrepository
WMI repository verification failed
Error code: 0x80041002
Facility: WMI
Description: Not found
Not sure where to go with this as the link Mike gave me was to resolve an 'inconsistent' repository whereas mine is 'not found'?
Report.Wer:
Version=1
EventType=CLR20r3
EventTime=132114534822603793
ReportType=2
Consent=1
UploadTime=132114534826931231
ReportStatus=268435456
ReportIdentifier=36c0ae39-f28a-47f6-a5b2-a93e933cf027
IntegratorReportIdentifier=ff9824ac-7660-4d78-829f-2486b2190f59
Wow64Host=34404
NsAppName=SourceTree.exe
OriginalFilename=Sourcetree.exe
AppSessionGuid=00000580-0001-0041-569f-502d785dd501
TargetAppId=W:0006ba146b147c809ea8648f1e21e648428c00000000!0000792400f98bb34e5620f88933ce436b15303a6a99!SourceTree.exe
TargetAppVer=2019//04//25:18:54:22!cc56c!SourceTree.exe
BootId=4294967295
TargetAsId=6450
UserImpactVector=3145728
IsFatal=1
EtwNonCollectReason=1
Response.BucketId=41c74cfe42dbbeaaf9ba1e2a98cc4838
Response.BucketTable=5
Response.LegacyBucketId=1853827364917364792
Response.type=4
Sig[0].Name=Problem Signature 01
Sig[0].Value=SourceTree.exe
Sig[1].Name=Problem Signature 02
Sig[1].Value=3.1.3.3158
Sig[2].Name=Problem Signature 03
Sig[2].Value=5cc2025e
Sig[3].Name=Problem Signature 04
Sig[3].Value=System.Management
Sig[4].Name=Problem Signature 05
Sig[4].Value=4.7.3190.0
Sig[5].Name=Problem Signature 06
Sig[5].Value=5b6947cb
Sig[6].Name=Problem Signature 07
Sig[6].Value=8c
Sig[7].Name=Problem Signature 08
Sig[7].Value=3f
Sig[8].Name=Problem Signature 09
Sig[8].Value=System.Management.Management
DynamicSig[1].Name=OS Version
DynamicSig[1].Value=10.0.17763.2.0.0.256.48
DynamicSig[2].Name=Locale ID
DynamicSig[2].Value=2057
DynamicSig[22].Name=Additional Information 1
DynamicSig[22].Value=d560
DynamicSig[23].Name=Additional Information 2
DynamicSig[23].Value=d56089eb7eefb2f102428b5144072daf
DynamicSig[24].Name=Additional Information 3
DynamicSig[24].Value=8718
DynamicSig[25].Name=Additional Information 4
DynamicSig[25].Value=871829f98eec2bc185774686c564e504
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LoadedModule[3]=C:\windows\System32\KERNEL32.dll
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LoadedModule[8]=C:\windows\System32\RPCRT4.dll
LoadedModule[9]=C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscoreei.dll
LoadedModule[10]=C:\windows\System32\SHLWAPI.dll
LoadedModule[11]=C:\windows\System32\combase.dll
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LoadedModule[20]=C:\windows\System32\kernel.appcore.dll
LoadedModule[21]=C:\windows\SYSTEM32\VERSION.dll
LoadedModule[22]=C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll
LoadedModule[23]=C:\windows\SYSTEM32\MSVCR120_CLR0400.dll
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LoadedModule[30]=C:\windows\System32\CRYPTSP.dll
LoadedModule[31]=C:\windows\system32\rsaenh.dll
LoadedModule[32]=C:\windows\System32\bcrypt.dll
LoadedModule[33]=C:\windows\SYSTEM32\CRYPTBASE.dll
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LoadedModule[37]=C:\windows\SYSTEM32\dwrite.dll
LoadedModule[38]=C:\Windows\Microsoft.NET\Framework64\v4.0.30319\WPF\wpfgfx_v0400.dll
LoadedModule[39]=C:\windows\System32\OLEAUT32.dll
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LoadedModule[43]=C:\windows\SYSTEM32\WindowsCodecs.dll
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LoadedModule[45]=C:\windows\System32\TextInputFramework.dll
LoadedModule[46]=C:\windows\System32\CoreMessaging.dll
LoadedModule[47]=C:\windows\System32\CoreUIComponents.dll
LoadedModule[48]=C:\windows\System32\SHCORE.dll
LoadedModule[49]=C:\windows\SYSTEM32\ntmarta.dll
LoadedModule[50]=C:\windows\SYSTEM32\wintypes.dll
LoadedModule[51]=C:\windows\system32\dwmapi.dll
LoadedModule[52]=C:\windows\System32\CRYPT32.dll
LoadedModule[53]=C:\windows\System32\MSASN1.dll
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LoadedModule[56]=C:\windows\System32\shell32.dll
LoadedModule[57]=C:\windows\System32\cfgmgr32.dll
LoadedModule[58]=C:\windows\System32\windows.storage.dll
LoadedModule[59]=C:\windows\System32\profapi.dll
LoadedModule[60]=C:\windows\System32\powrprof.dll
LoadedModule[61]=C:\windows\assembly\NativeImages_v4.0.30319_64\netstandard\fdade94df8d239ca4901354bbc201645\netstandard.ni.dll
LoadedModule[62]=C:\windows\assembly\NativeImages_v4.0.30319_64\System.Management\2285986795d6214ee4363805b929b6be\System.Management.ni.dll
LoadedModule[63]=C:\windows\System32\clbcatq.dll
LoadedModule[64]=C:\windows\system32\wbem\wmiutils.dll
LoadedModule[65]=C:\windows\SYSTEM32\wbemcomn.dll
LoadedModule[66]=C:\windows\System32\WS2_32.dll
LoadedModule[67]=C:\windows\system32\wbem\wbemprox.dll
LoadedModule[68]=C:\Windows\Microsoft.NET\Framework64\v4.0.30319\wminet_utils.dll
LoadedModule[69]=C:\windows\system32\wbem\wbemsvc.dll
LoadedModule[70]=C:\Windows\Microsoft.NET\Framework64\v4.0.30319\diasymreader.dll
State[0].Key=Transport.DoneStage1
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OsInfo[0].Key=vermaj
OsInfo[0].Value=10
OsInfo[1].Key=vermin
OsInfo[1].Value=0
OsInfo[2].Key=verbld
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FriendlyEventName=Stopped working
ConsentKey=CLR20r3
AppName=Sourcetree
AppPath=C:\Users\P10484230\AppData\Local\SourceTree\app-3.1.3\SourceTree.exe
NsPartner=windows
NsGroup=windows8
ApplicationIdentity=A1A3B353042137254B4BB820DDA52941
MetadataHash=-808141759