New answers tagged datafile
(Consolidating the comments into an answer, so it's more easily consumable by searchers.) It appears this is related to not granting the appropriate permissions to the data container when moving the location of the physical files. Without having tried it, I believe this would also apply to user databases, not just tempdb. I have an old, but still ...
Based on the error messages provided. It would appear that MySQL is reading the values as an empty string '', in other words NULL which is why you are seeing the 0 values. I would look closely at the data format in the file. Providing a small sample of the actual data would be helpful.
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