Hi again,.
the VPILOT devs has also reported this now in the dev forum. It looks really a bug or it is not intend to priorized Marketplace sceneries.
None Marketplace sceneries can be re-ordered correctly.
We will see what MS/ASOBO say but I assume without there help, VPILOT nor we can fix this.
Thanks again
Richard
PS: and it seems that is not a SU10 issue, when you have done tricks before also to use this scenery