Hickory: There is a problem with the tutorial, because the GOG version creates an alias for 6 discs, and the original only came on 5 discs, so check your baldur.ini, and for the [Alias] section make sure there is not 6 CD entires. Let's assume that your BG2 is installed to C:\Games\GOG.com\Baldurs Gate II\, then check the following...
This is WRONG:
[Alias]
HD0:=C:\Games\GOG.com\Baldurs Gate II\
CD1:=C:\Games\GOG.com\Baldurs Gate II\data\
CD2:=C:\Games\GOG.com\Baldurs Gate II\data\
CD3:=C:\Games\GOG.com\Baldurs Gate II\data\
CD4:=C:\Games\GOG.com\Baldurs Gate II\data\
CD5:=C:\Games\GOG.com\Baldurs Gate II\data\
CD6:=C:\Games\GOG.com\Baldurs Gate II\data\
This is RIGHT:
[Alias]
HD0:=C:\Games\GOG.com\Baldurs Gate II\
CD1:=C:\Games\GOG.com\Baldurs Gate II\data\
CD2:=C:\Games\GOG.com\Baldurs Gate II\data\
CD3:=C:\Games\GOG.com\Baldurs Gate II\data\
CD4:=C:\Games\GOG.com\Baldurs Gate II\data\
CD5:=C:\Games\GOG.com\Baldurs Gate II\data\;C:\Games\GOG.com\Baldurs Gate II\CD5\
I have Alias's for 6CDs & Easy Tutu never asks for discs.