I think that maybe one of those windows update mess up my calibre:
1. Security Update for Microsoft Office Compatibility Pack Service Pack 3 (KB3115309)
2. Security Update for Microsoft Office Word 2007 (KB3115311)
3. Update for Windows 10 Version 1511 for x64-based Systems (KB3173428)
4. Security Update for Microsoft Office Excel 2007 (KB3115306)
5. Cumulative Update for Windows 10 Version 1511 for x64-based Systems (KB3172985)
6. Security Update for Microsoft Office Compatibility Pack Service Pack 3 (KB3115308)
7. Windows Malicious Software Removal Tool for Windows 8, 8.1, 10 and Windows Server 2012, 2012 R2 x64 Edition - July 2016 (KB890830)
8. Security Update for Adobe Flash Player for Windows 10 Version 1511 for x64-based Systems (KB3174060)
Mainwhile I'll try your sugg.
Txs
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