Issue with paint brush [Cant edit brush settings???]

[rich2005]

Yeah....I sort of guessed that you had closed the tool options (amongst other things)

My advice is reset the dock back to the default settings. Look in Edit -> Preferences for Window Management.

   

Then restart Gimp.

..and stop using the brush editor. Really it is a bit of a legacy from earlier Gimp versions. Only really needed for making parametric (.vbr) brushes.