A future update of Yamaha Expansion Manager (YEM) will only solve the problem with using the "Genos Complete Pack" for Genos 2 in YEM....
I think it is more problems that has to be solved.
YEM v2.10 is downloadable at G1 site as well, and it seemed to work well for a while, but stood spinning at same level at end of progressbar for more than 1.5 hour. !!
Uninstalled and reinstalled, same thing happened. Then uninstalled and installed v2.7 again, and everything worked well. 45 minutes to fulfill the task.
I also found v2.9 slower when when that version came out, and went back to v2.7. At least it works well for me at G1.
However,
older versions than 2.10 is not compatible with Genos2, so to try older versions will not work.
Btw, regarding G1 Expansion Packs.
Have any of you that took backup of G1's HD tried to load the styles stright from the Expansion folder in backup? It's there, prs files, rgt files, vce files, sfx files and more, so maybe G2 will load and play those?
Try put the old 'Expansion' folder to USB stick and load the styles. It may work and sound reasonable well just as many other 'older' stuff.