Hi,
What's the usual cause for when selecting an object and activate any of the TRS transforms, no gizmo is shown?
In my case, the object has taken quite the beating: has been “linked” to a skeleton and “disconnected” countless times.

Changed your name McNistor?

Maybe check to see if the handle has been turned off. Hold down the little transform gizmo button (above the snapping buttons) and make sure the Geo Transformer part is checked. This is a per-object setting. Otherwise, the transform fields on the object aren't locked are they? That would also cause the associated handles to disappear. Hope that helps.

Yeah, you found me.

I've solved my issue by deleting the Obj and creating a new one (it was a simple file import).
Trying this with a new object doesn't seem to work; unchecking Geo Transformer will get rid of the handles but I still can access the other TRS handles. No channels were locked. I think.
Anyway, problem solved for now.