This is just a guess:
From your reference, the error concerns a function xcf-seek and I did find one bug report on that subject. Looks like it was fixed.
This is the start of the change log for 2.8.16
Changes in GIMP 2.8.16:
Core: Seek much less when writing XCF
Core: Don't seek past the end of the file when writing XCF
Core: Fix velocity parameter on .GIH brushes
Core: Fix brokenness while transforming certain sets of linked layers
Could be either or both first two, could be the fourth if using layers.
Regardless, it would be worth upgrading from Gimp 2.8.14 to the latest.
Other than that,
Big file coming in from a Nikon perhaps.
What format does it start as? Using a plugin to import a RAW file?
Lots of filters used. Have you tried saving a .xcf version after each filter application until it breaks?
Simplify the save path and file name, maybe C:\temp\01.xcf until you get it sorted.
From your reference, the error concerns a function xcf-seek and I did find one bug report on that subject. Looks like it was fixed.
This is the start of the change log for 2.8.16
Changes in GIMP 2.8.16:
Core: Seek much less when writing XCF
Core: Don't seek past the end of the file when writing XCF
Core: Fix velocity parameter on .GIH brushes
Core: Fix brokenness while transforming certain sets of linked layers
Could be either or both first two, could be the fourth if using layers.
Regardless, it would be worth upgrading from Gimp 2.8.14 to the latest.
Other than that,
Big file coming in from a Nikon perhaps.
What format does it start as? Using a plugin to import a RAW file?
Lots of filters used. Have you tried saving a .xcf version after each filter application until it breaks?
Simplify the save path and file name, maybe C:\temp\01.xcf until you get it sorted.