Hello Steven,
I have checked the year fields, they seem ok.
See first screenshot for an example where Album Grouping does not work when using <Year (yyyy)> field (tried also with <Year> and same applies), i.e. the album with year=1990 is grouped correctly but the albums with the same album name with years 2003 and 2013 are grouped as one album...
Second screen shot shows Album Grouping by folder, which does the job!
Thanks for looking into it.
Very kind regards,
Maarten
Edit: I am using MB version 3.0.6044
Edit: ssri, many thanks for your support also (forgot to mention initially, excuse me), at your suggestion I have posted screenshots below.