If you are correct then the issue must lie elsewhere as the sync would update all files with a new date or size and the new tag data would be picked up by squeezeserver at the next scheduled scan.

I'll investigate further.

Thanks.

Video Sources: Cheap Samsung BluRay, Xbox One, Virgin TiVo HD
Audio source: Hifiberry DIGI on Raspberry pi running
max2play.
Music server: MacMini '06 running iTunes library
Output (3.0): G61R, HDmax421, DSP5000, DSP33C and Samsung 29in LCD