Action window disapears upon double click (NO BUG)

On os-10.5.6 on an intel imac. Reaper 2.58. When opening the action list window and then double clicking on an action to attempt to modify it, the whole window just disapears. The workaround is to just click the add button, add the new command and then delete the previous. Not a huge deal because but Pretty annoying.

Double clicking an action runs the action (and closes the window). I think you want the "edit" button.

I often stumble over that one, too.