I can't see camera path curves and camera itself, only green rhombus while in spectate mode. Playing on fabric + sodium + iris.
I tried to make green rhombus appear and disappear by changing settings but it doesn't help. Currently i have the last version of replay mode compatible with sodium and also the last version of iris shaders. It's the first time i download this mod, so the answer can be obvious. Anyway i hope there is a simple solution.
(I don't have any shaders and other mods installed)

Does it show when you remove Sodium (and Iris)?
And which MC version is this?
Please also explicitly list the versions of your mods. "last version" doesn't really tell much because every version was the last version at some point (and who knows when or where you got it from).