FreeFileSync Forum

Bob, did you get help on this? I'm suddenly having massive issues with sync speed (after working well for years, the syncs drag). I'm considering going to the donation edition, but if you can't even access it and there's little to no support, I'm going to look for other options altogether.

Saw this problem referenced a few times, but no solution provided. I last ran this sync a month ago without issue. But now I keep getting: ERROR_INVALID_FUNCTION: Incorrect function. [CopyFileEx]