Hi, I have a problem with extruding. I don't have this blue dot to change manipulator from local to world space. I can't click into it with mouse1. This 'monitor turn on/off' symbol is only activate when I click on it with mouse3 - move in local space. I have no any idea what's going on.
So you can see the manipulator toggle icon, but you can't left-click on it? That's very strange. I don't know what would cause that problem.
Note that an extrusion creates a history node, so you can use that to manipulate the extrusion in world and local space as you wish (e.g. click on name of attribute in Channel Box, then middle-mouse drag in viewport to change it). Not as intuitive or interactive as the actual manipulator, unfortunately.