Hi all, I have the Same Problem since the Last iTunes Update. Albums suddenly split up, when playing a track. When playing a track, this track disappears from the "Original" Album and creates a new album. This happens with each track, each played track "wanders" from the original album to the "new" album......so in the end - after playing/doubleclicking each track - there is ONE album AGAIN. Unfortunately this happens not always, often the albums keep split.
I've tried every solution, especially editing Album artist, Artist and sort criteria (artist, Album artist) accordingly (=setting those tags/metainformation identical).
This helps only temporarily, the split Albums get "reunited" BUT, after ONE day or so, Albums, which didn't split shortly after editing (I tested it multiple times), start splitting up again!!
IMO it is definitely a severe bug in iTunes (12+Yosemite)
Interestingly, the split Albums have different tags again (e.g. different artists or Album artitst), altough BEFORE splitting up, ALL tags (especially Artist and Album artist and all sort criteria) were definitely IDENTICAL in all tracks. I checked this over and over.
It seems to me hat iTunes doesn't "remember"=store correctly manual edits of tags/Meta-Information.
Furthermore, this happens mostly with Albums bought via iTunes, whose tags/Meta-Information has been edited once, but not with self-ripped CDs.