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Contents (3)

First Checks
If It Worked Before and Stopped
When Only Some Items Are Blank

First Checks

If holding Ctrl does nothing, work through these before assuming the mod is broken:

Keybind conflict. Open Options → Controls and search for anything else bound to Ctrl. Sprint, zoom, and freecam mods commonly grab it. Rebind the conflicting action or the description key.
Wrong screen. Descriptions appear in most inventory-style GUIs, but some custom mod screens do not render them. Test in a vanilla chest or your own inventory first.
Hovering the wrong thing. You must hover the actual item icon. Hovering a slot border or empty space shows nothing.

If It Worked Before and Stopped

A description set that suddenly goes blank usually means the description data failed to load. Fully restart the game rather than just leaving and re-entering a world — the data is read at launch. If it is still blank after a restart, check whether you recently added or removed mods, since a load-order or data conflict can suppress descriptions.

When Only Some Items Are Blank

This is normal. Not every item has a description, and some are deliberately left without one. If a whole mod's items are blank while vanilla items work, that mod likely has no description support yet, and you will only see generic tag-based text, if anything.