1. I can play FLAC files
Did you try to right-click import in Playing Now?
2. "FLAC" appears under audio File Associations
3. Tools -> Options -> Encoding -> FLAC is checked
These are not related to importing.
4. Upgrade to 12.0.663. The problem persists.
I guess you mean 12.0.363.
Is the FLAC input plug-in listed in Tools > Plug-in Manager > Input > FLAC Plugin ?
When i try to import a folder, MC reports 0 new files imported.
Did you try use the Import Folder tool or some other method?
If you used the Import Folder tool,
- did you select "FLAC" in the Advanced import settings?
- have you previously removed the same files from library? If yes, untick the "Ignore files previously removed from library" Advanced import setting.
If you have configured several folders for the Auto-Import feature you need to check the Advanced Options for each folder separately.