Short description of error
Some Tooltips gives the "internal error!" when using custom keymaps. Also some info disappears.
Measure tool example.
Exact steps for others to reproduce the error
Launch Blender, go to Edit / Preferences / Keymap section / Export the keymap configuration. Now import that same keymap you just exported and that error will happen.
Also a side effect of using a custom keymap is that the preferences section inside the keymap tab also disappears.