Acronis 2018 / W10 1803 will not make backup of OneDrive local folders and files

Situation: I have updated Windows 10 from 1709 to 1803
With Windows 10 1709: Acronis 2018 works perfectly.
With Windows 10 1803 there were problems: Acronis 2018 / W10 1803 will not make backup of OneDrive local folders and files. I get error messages and may stop backing up OneDrive.
All other drives, folders and files were backed up OK.
What have I done:
- Ensured that I, System and Administrator have access to all my local folders, subfolders and files in OneDrive.
- That these folders are always available, and fully updated on my PC
- Downloaded the latest Acronis, 11530
- Uninstalled the old version??
- Rebooted PC, and installed the new version of Acronis.
With Windowes 10 1803 and Acronis 2018, 11530: Still the same problem.
Can anyone suggest what I can do?
I don't think that a fall-back to 1709 will result in something different than that Acronis works OK again.
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I am getting a slightly different message (folder does not exist or is corrupt - suggest running disk scan), and the backup aborts.
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Gigabyte Aorus GA-AX370-Gaming 5 M/B; AMD Ryzen 1700X; 16gig RAM; 2 x 500 gig Samsung 970 EVO PCIe NVMe, 1 x 250 gig Samsung 960 EVO PCIe NVMe drives + other drives (Windows 10 Pro 64)
Gigabyte Aorus B360 Gaming 3M/B, Intel i5 9400; 16gig RAM; 1 x 500 gig Samsung EVO Plus PCIe NVMe + 1 x 250 gig Samsung 960 EVO PCIe NVMe + other drives (Windows 10 Enterprise 64)
Gigabyte Aorus H370 Gaming 3M/B, Intel i5 9400; 16gig RAM; 1 x 500 gig Samsung EVO Plus PCIe NVMe + 3 x Kingston HyerX Fury 240gig RAID 5 + other drives (Windows 10 Enterprise 64)
Synology DS414 NAS 4 x 4TB WD Red HDD

I am having the same issue after upgrading to Windows 10 1803. The error says: "Failed to back up file or folder F:\Onedrive': It may be blocked by another application", see attached image. I closed all office applications and windows explorer but always get this error. Any idea on what the conflict is?
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Have a look at the last post in this thread - the solution there may work for you.
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Gigabyte Aorus GA-AX370-Gaming 5 M/B; AMD Ryzen 1700X; 16gig RAM; 2 x 500 gig Samsung 970 EVO PCIe NVMe, 1 x 250 gig Samsung 960 EVO PCIe NVMe drives + other drives (Windows 10 Pro 64)
Gigabyte Aorus B360 Gaming 3M/B, Intel i5 9400; 16gig RAM; 1 x 500 gig Samsung EVO Plus PCIe NVMe + 1 x 250 gig Samsung 960 EVO PCIe NVMe + other drives (Windows 10 Enterprise 64)
Gigabyte Aorus H370 Gaming 3M/B, Intel i5 9400; 16gig RAM; 1 x 500 gig Samsung EVO Plus PCIe NVMe + 3 x Kingston HyerX Fury 240gig RAID 5 + other drives (Windows 10 Enterprise 64)
Synology DS414 NAS 4 x 4TB WD Red HDD
Acronis Links : Acronis Scheduler Manager : Acronis VSS Doctor : Backup Archive Compatibility : Cleanup Tool (All versions) : Cloning Disks : Contact Acronis Support : Difference between Backup and Disk Clone : Repair program / settings
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