Unable to use the tweak tool

hi, i’m unable to use the tweak tool, it never worked for me. any idea?

What do you mean “it never worked”?
How are you using it?

i can’t select a vertex & drag it in edit mode. the vertex is just not moving(locked).

Did you try to load factory settings?
Which blender version are you using?

thx works, but now i lost all custom shortcuts ^^