Actually, the source code specifies "ENV:Zune/", i.e. Zune is capitalized but not "all-caps".
If there are graphical glitches when the application accesses "ENV:zune/" but there are none when you use either "ENV:Zune/" or "ENV:ZUNE/", this could suggest there is a bug related to paths and case sensitivity in AROS itself that needs to be addressed.
Also, if "ENV:zune" is the default spelling, why don't you fix it in Odyssey yourself since you managed to compile it?