Hi there,
I got the same error - suddenly after 1 year use (of course in the middle of a project).
After searching for the cause for a long time, I found out that AVG antivirus has implemented a new function - ransomware protection - and it simply blocks ALL .exe files from writing to the disc if they are not approved
ShotCut was approved - BUT NOT melt.exe, which make the actual export processing. When I approved that - everything seems to function again
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