Hi Bert
I think I've found an answer to your problem. Custom styles loaded into Custom Memory are OK providing you dont use Music Stylist (Which I don't)
If you want Music Stylist to work correctly, then you need to load the Custom Style in No. 1 position and save the MSA variations into Panel Memories 1,2,3, & 4. Then copy the custom files into Composer A - then simply copy it back into Custom Panel. Then repeate for each Custom Style. Afterwards the Music Stylist will identify the correct Custom Style.
It's a long winded process but it WORKS.
I couldn't understand why my own favourite Custom Styles responded correctly when using Music Stylist - then I realized that they had all been copied from Composer to Custom Panel using my own settings in Panel Memories 1,2,3, & 4. not just downloaded straight in Custom Panel.
John