You can do it here: https://www.mediamonkey.com/support/

sorry, but I seem not to bee familiar how to open a Support Ticket ?

Please open a Support Ticket and offer your database and exact reproduction steps.

As a (very) long time user of MM the reported tree-display problems are obvious and happen unfortunately on other occasions (without any clue of why)
- and it seems as if I am not the only one --> "Album Artist disappears when spelt correctly".

Albums are associated with the Album Artist value. It sounds like it's only showing the Albums where the Album Artist has the value of the selected item in the Media Tree.

Selection of tree node "Artist & Album Artist" showes with artist "Xavier Naidoo" selection in tree only 3 albums. Archive listing shows the correcte contents.

When changing the artist in the tree to e.g. "Xavier NaidooO" the correct album information is displayed in the tree.

Changig the artist back to the correct name "Xavier Naidoo" the same only limited information is displayed !?

I have checked with some other multiple albums of other artists without any problems yet.

MM 4.1.31.1919 version. Microsoft Windows 10 Home Build 1042