I think I can recreate a similar problem.
If I go into the stylepicker and:
- select _GAIA
- play demo song
- press ok
Then _GAIA will not load into the chord sheet.

If I go into the stylepicker and:
- select _GAIA
- play from chord sheet in the style picker
- press ok
Then _GAIA will load OK into the chord sheet.

And it is a similar bevhaviour with several other styles. Might be worth trying.

Another way would be in the style picker to mark _GAIA as favourite.
Then from the chord sheet never go into the style picker just right click and select Favourite Styles and the select _GAIA in the list (this without going into the style picker)

Both ways work on my PC.