New installation teething problems

[simoncn]

The format for Genre (TCON frame) changed between ID3v2.3 and ID3v2.4. For example, Rock is '(17)' in ID3v2.3 and '17' in ID3v2.4 (no parentheses).

Your tagging program should have made the necessary changes when it converted the tags from ID3v2.3 to ID3v2.4 but it seems it is incorrectly using the ID3v2.3 Genre format in ID3v2.4 tags.

For various reasons, ID3v2.4 is better than ID3v2.3 so I don't recommend going back to ID3v2.3. Can you use a different tagging program to do a correct conversion from ID3v2.3 to ID3v2.4?

Alternatively, you could fix this by doing a bulk replacement of '(17)' with '17' etc. in all your ID3v2.4 files if your tagging program provides this capability.