ALBUM > AlbumArtist corruption with Composer

[Minimtc]

I use the JPlay IOS app with a Melco N100 server.

Since last Thursday, 5th Feb my albums have been scrambled when viewing in Jplay following a Minimserver rescan after the latest update.
Albums that do not have Composers in the tags, seem to be ok.

I have a combination of AlbumArtist and Composer tagged to my albums which are displayed using
tagformat>> Group.displayFormat={$composer^^: $group}

When showing all albums, what I am expecting as AlbumArtist is showing as the one of the listed Composers of one of the tracks within the album.
So I have albums like
* Wonderful World (Sam Cooke) showing as "George Gershwin" and Artist shown as "George Gershwin".
* 30 (by Adele) showing as "Tobias Jesso Jr."


I have since tried (unsuccessfully) the latest Minimserver updates 268, 269 for Minimserver2 and also tried re-creating the indexes with
StartupScan>> full


On a side note, how can I regress to a previous version of Minimserver before last Thursday, to see if that would resolve the problem?
I have attached my latest profile file used within Minimserver.