Gizmodal Ops (1.0.1)
My settings are reset after closing Blender
If Auto-Save Preferences is disabled, you need to go to Edit > Preferences > Save Preferences to make sure that your addon settings are saved.
I've switched my Keymap and now Gizmodal Ops doesn't work.
Since Gizmodal Ops modifies the active Keymap in order to work, you need to restart Blender after enabling another Keymap. Gizmodal Ops should now work with your new Keymap.