I did the following:
-I removed MJ9 from my laptop (I uninstalled the application and I removed MJ folder).
-I installed MJ8.388 and I registered it.
-I copied 50 files from my destop to my laptop. They are mpc, ogg and mp3 files most of them with cover art inside (all but mpc files) and custom1, custom2 tags filled. All mp3 have id3-v2 and no id3-v1.
-I run MJ8 and before to import anything I set mp3 plugin to remove id3-V1 if existing and create id3-v2 if not existing.
-I imported my files into MJ8. I checked them; all ok except mpc files lost custom1 and custom2 as these fields are not written in APE 1.0 tags.
WinVorbis gives me the following:
MJMETADA=<MPL Version="1.0"> <Item> <ExInfo Custom1="cd"
Custom2="Psychedelic Pop, Baroque Pop, Pop/Rock, Soft Rock, Adult
Contemporary, Disco" ReplayGain="1|0|-1|0|0|" Rating="0"/> </Item>
</MPL>
so you can check at least ogg files have custom1 and custom2 tags inside the files.
-I exited MJ8 and I installed MJ9. I answered 'yes' to upgrade.
I got the following : all columns are displayed:
.../width/height/empty
within this column without title MJ displays my custom2 fields. There is no custom1 field column.
If I try to give a name ("style" for example) to the "empty title" column through Tree & View settings (the last line of the list which is blank) then the column title continues empty but all contents become "N/a" !
cover art: it is fixed, I got them into MJ9.