Just to clarify...are you having trouble with my
Inventory mod, or my
Inspect Player mod?
The Inventory window is what you see when you press "I"...the Inspect Player window will only be seen when you right-click and "Inspect" another player (or when you right-click on your own name in the player window and "Inspect").
More details please.
Does the window just not show up in-game? Does it crash your client when you try to "Inspect"? Are you still seeing the default inspect window?